# A027233 (b-file synthesized from sequence entry)
2 1
3 7
4 34
5 184
6 785
7 4107
8 16894
9 88397
10 358212
11 1892182
12 7609892
13 40695540
14 162938176
15 882569071
16 3523144085
17 19320028921
18 76956041950
19 426863069443
20 1697410759579
21 9513773568608
22 37779519792187
23 213739273560729
24 847809431322520
25 4836704323382544
26 19167125562029304