# A073984 (b-file synthesized from sequence entry)
1 0
2 1
3 9
4 36
5 210
6 1296
7 7056
8 40824
9 262440
10 1700352
11 10478160
12 62355744
13 367960320
14 2176782336
15 12958657344
16 77716392192
17 468205557120
18 2821109907456
19 16960580969472
20 101758315958784
21 609954817881600
22 3656220357427200
23 21926486787222528
24 131557435432187904