# A132467 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 90
4 2520
5 16200
6 7484400
7 681080400
8 11675664000
9 12504636144000
10 2375880867360000
11 78404068622880000
12 8910391798788480000
13 49229914688306352000000
14 2658415393168543008000000
15 476169110129306674080000000
16 4015057936610313875842560000000
17 321778214634055154906810880000000