# A156094 (b-file synthesized from sequence entry)
0 1
1 1
2 31
3 281
4 2101
5 14851
6 102961
7 708761
8 4865911
9 33372361
10 228792301
11 1568309051
12 10749725281
13 73680695281
14 505017569551
15 3461448647801
16 23725139605861
17 162614572159411
18 1114576979567761
19 7639424583421961
20 52361395886149351