# A075916 (b-file synthesized from sequence entry)
0 1
1 36
2 900
3 19440
4 390096
5 7511616
6 141134400
7 2611802880
8 47870735616
9 871982724096
10 15819463296000
11 286235993272320
12 5170077903015936
13 93275375604350976
14 1681524519443251200
15 30298254922942709760