# A037212 (b-file synthesized from sequence entry)
0 1
1 0
2 720
3 17640
4 726570
5 17236728
6 223847280
7 1928224440
8 12500672580
9 65073916440
10 284229347328
11 1080456070680
12 3650778821970
13 11191823745120
14 31612753519200
15 83017908015624
16 204808695842610
17 479043914067360
18 1065816689968080
19 2271147404056200