# A132097 (b-file synthesized from sequence entry)
0 1
1 4
2 72
3 96
4 21600
5 640
6 5080320
7 580608
8 326592000
9 20736000
10 2529128448
11 1094860800
12 1298164008960000
13 399435079680000
14 11298306539520000
15 231760134144000
16 48978158848819200000
17 768284844687360000
18 81541143706048266240000
19 1009797445276139520000
20 467359502609929273344000000