Ok the best way I can explain it is that block are allocated per mint and time...
http://www.uspapermoney.info/serials/f2006_s.htmlThen when printing of SN (The last process) They are not in sequince.
For those wondering how the calculation works out. Even though they print 32.. When it goes for the SN its in sheets of 18... So if you want to figure out what sheet your note was printed on take the last four digits (THATS THE BASE SHEET NUMBER) * anything over 15 /16 + 1 (-The starting Block assigned). Then you can figure your starting bill and offset FYI!
1 -10001 -1 -2
20001 -30001 -3 -4
40001 -50001 -5 -6
60001 -70001 -7 -8
80001 -90001 -9 -10
100001 -110001 -11 -12
120001 -130001 -13 -14
140001 -150001 -15 -16
4 -10004 -1 -2
20004 -30004 -3 -4
40004 -50004 -5 -6
60004 -70004 -7 -8
80004 -90004 -9 -10
100004 -110004 -11 -12
120004 -130004 -13 -14
140004 -150004 -15 -16
3402 -13402 -1 -2 -6
23402 -33402 -3 -4 -26
43402 -53402 -5 -6 -46
63402 -73402 -7 -8 -66
83402 -93402 -9 -10 -86
103402 -113402 -11 -12 -106
123402 -133402 -13 -14 -126
143402 -153402 -15 -16 -146
First 4 -Multi -sheet -Last 4 -Bill Number
0 -1 -3402 -3402 -3402
1 -1 -3402 -3402 -13402
10 -1 -3402 -3402 -103402
15 -1 -3402 -3402 -153402
16 -2 -6804 -3402 -163402
23 -2 -6804 -3402 -233402
31 -2 -6804 -3402 -313402
32 -3 -10206 -3402 -323402
Quick Example BILL(00233402) SN first 4 is 23 and last four is 3402. This is Sheet 6804 (*18 bills a sheet -18) + Bill offset!
So the bill offset is 3 So ((6804 * 18)-18)+3 = 122457
122457 is the actual print number of the final bill!
If you want to get tech! 2 bills are printed at the same time so really its a twin print of 122457 / 2