# A144352 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 36
5 166
6 968
7 6372
8 49368
9 429240
10 4198176
11 45268416
12 535590144
13 6879038400
14 95412176640
15 1419918128640
16 22571960048640
17 381596438638080
18 6836248502784000
19 129352329079142400
20 2577689266340966400
21 53957785094515814400
22 1183674698660605132800