# A274056 (b-file synthesized from sequence entry)
1 1
2 4
3 90
4 5040
5 529200
6 89812800
7 22475653200
8 7791559776000
9 3576325937184000
10 2100278686746240000
11 1536353859354874560000
12 1369954918280131223040000
13 1462916144877711556032000000
14 1843274342545916560600320000000
15 2706157144150223750531344800000000