# A001237 (b-file synthesized from sequence entry)
1 31
2 3661
3 1217776
4 929081776
5 1413470290176
6 3878864920694016
7 17810567950611972096
8 129089983180418186674176
9 1409795030885143760732160000
10 22335321387514981111936450560000
11 497400843208278958640564703068160000
12 15161356456130244705175927906904309760000