# A009272 (b-file synthesized from sequence entry)
0 1
1 2
2 12
3 232
4 7952
5 405152
6 31111872
7 3115956352
8 414147567872
9 68413355397632
10 13936708915940352
11 3412444856961083392
12 987956358173680013312
13 334650367409781717573632
14 130572314003924554412900352
15 58337032599905770133366013952