# A119698 (b-file synthesized from sequence entry)
0 0
1 2
2 48
3 2160
4 40320
5 787500
6 12773376
7 198942744
8 2905943040
9 40973240880
10 558886900000
11 7437264466632
12 96894798594048
13 1240510066959800
14 15645553270401600
15 194802398523000000
16 2398428702498447360
17 29240457953102773740
18 353391128284307097600