# A253282 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 12
4 124
5 1844
6 39288
7 1134928
8 42346256
9 1985443536
10 114380311072
11 7938644848832
12 653292526793664
13 62901472582993984
14 7005466255571255168
15 893590563265303934208
16 129425758313629525647616
17 21124489015640181154724096
18 3859303832272520341300756992