# A132228 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 8
4 52
5 504
6 6808
7 122304
8 2820048
9 81183200
10 2853990496
11 120321094656
12 5991955466560
13 347996920977664
14 23312947041336960
15 1784445116557881344
16 154767015393810489600
17 15098457734490931766784