# A012721 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 350
4 16280
5 1280458
6 151282316
7 25067231982
8 5547679327632
9 1580745016902930
10 563647979697490836
11 245869122688036168950
12 128799713392548410995032
13 79791827954988156443060506