# A012662 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 6
4 21
5 100
6 957
7 8498
8 70217
9 762696
10 9950809
11 128378910
12 1775380893
13 28325140012
14 483428842197
15 8558590549322
16 163465935697169
17 3367220579004048
18 72712394227734577
19 1648059951297530166