# A157132 (b-file synthesized from sequence entry)
1 2
2 3
3 40
4 1260
5 7983360
6 1037836800
7 50812489728000
8 15205637551104000
9 2872446304320552960000
10 884176199373970195454361600000
11 747530786743447528884142080000000