# A012231 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 9
6 49
7 281
8 1345
9 13233
10 105441
11 1179729
12 10336833
13 144386553
14 1580651409
15 25501409961
16 316289380737
17 5869292202465
18 83559601907649
19 1744083324947745
20 27709107620492673
21 643531258862953065