# A173212 (b-file synthesized from sequence entry)
0 1
1 4
2 36
3 1056
4 73200
5 9179640
6 1794887640
7 500614248960
8 187826632116480
9 90939137506660800
10 55080912083696452800
11 40741241351161144147200
12 36096696228114024645542400
13 37707879201499850798028974400