# A365283 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 12
4 120
5 1380
6 19440
7 341040
8 7029120
9 164762640
10 4355769600
11 128527439040
12 4181332700160
13 148633442717760
14 5734427199621120
15 238676208285715200
16 10659325532663808000
17 508452777299622355200
18 25800664274991135129600