# A375050 (b-file synthesized from sequence entry)
0 0
1 1
2 18
3 576
4 29400
5 2205225
6 228953088
7 31473598464
8 5537223659520
9 1213834310015625
10 324468643299372000
11 103900389446258786304
12 39267840204934404964992
13 17296280109081832136303025
14 8783270052027947513856000000
15 5094007565002120817604034560000