# A001784 (b-file synthesized from sequence entry)
0 1
1 24
2 924
3 26432
4 705320
5 18858840
6 520059540
7 14980405440
8 453247114320
9 14433720701400
10 483908513388300
11 17068210823664000
12 632607429473019000
13 24602295329058447000
14 1002393959071727722500
15 42720592574082543120000