# A091363 (b-file synthesized from sequence entry)
0 0
1 1
2 16
3 162
4 1536
5 15000
6 155520
7 1728720
8 20643840
9 264539520
10 3628800000
11 53129260800
12 827714764800
13 13680764697600
14 239217231052800
15 4413400992000000
16 85699747381248000
17 1747492334235648000
18 37338643451805696000
19 834363743704178688000