# A347023 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 72
4 1254
5 28794
6 819888
7 27869316
8 1101032100
9 49570797780
10 2505156062472
11 140417898936336
12 8644973807845368
13 579908437058338920
14 42098286646367326368
15 3288252917244250703664
16 274974019392668843164176
17 24510436934573885695407504
18 2319947117871178825560902112