# A124535 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 36
4 216
5 961
6 5977
7 39363
8 271564
9 1949165
10 14487241
11 111115804
12 877086405
13 7109569724
14 59075905996
15 502464618671
16 4369068613929
17 38796820526316
18 351496911119002
19 3246426019892427
20 30543990287835441