# A367475 (b-file synthesized from sequence entry)
0 1
1 6
2 54
3 636
4 9204
5 157584
6 3111312
7 69533472
8 1734229344
9 47733263232
10 1436801816448
11 46942939272960
12 1654215709835520
13 62533593070755840
14 2524077593084160000
15 108339176213529384960
16 4927173048408858531840
17 236673892535088351744000