# A264707 (b-file synthesized from sequence entry)
1 1
2 1
3 4
4 28
5 176
6 1600
7 16128
8 124416
9 1446336
10 35831808
11 1074954240
12 27136622592
13 711858585600
14 16840949760000
15 456855552000000
16 22466543616000000