# A036771 (b-file synthesized from sequence entry)
0 1
1 4
2 420
3 201600
4 264264000
5 734557824000
6 3723191087616000
7 31125877492469760000
8 399532678960326912000000
9 7462849882264211635200000000
10 194563959280510261541299200000000
11 6847568575944052279580806348800000000
12 316573366618757452963440048714547200000000