# A007274 (b-file synthesized from sequence entry)
0 1
1 6
2 36
3 216
4 1260
5 7206
6 40650
7 227256
8 1262832
9 6983730
10 38470224
11 211220814
12 1156489782
13 6317095284
14 34435495872
15 187380150468
16 1018035642054