# A113986 (b-file synthesized from sequence entry)
0 1
1 4
2 13
3 43
4 153
5 603
6 2657
7 13111
8 72273
9 443147
10 3007077
11 22462571
12 183744033
13 1637653579
14 15828157233
15 165167123583
16 1853228997585
17 22274643111107
18 285799117829549
19 3902028545084315
20 56522214876304249
21 866295289106559595