# A081923 (b-file synthesized from sequence entry)
0 1
1 4
2 18
3 92
4 536
5 3552
6 26608
7 223456
8 2085504
9 21450752
10 241320704
11 2949474816
12 38933066752
13 552141672448
14 8374148696064
15 135274709700608
16 2318995023429632
17 42051109758173184
18 804227474125029376