# A365978 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 0
4 6
5 24
6 90
7 1008
8 7560
9 54432
10 712152
11 7620480
12 81130896
13 1266632640
14 17587441872
15 246734377344
16 4527397929600
17 77238618702336
18 1340945212763520
19 28407941067018240
20 574640938744314624
21 11868502219930137600
22 285787326567523173120