# A001241 (b-file synthesized from sequence entry)
1 1
2 50
3 1660
4 46760
5 1217776
6 30480800
7 747497920
8 18139003520
9 437786795776
10 10536798272000
11 253246254177280
12 6082300519393280
13 146028165842661376
14 3505313580591718400
15 84135194495708938240
16 2019336829962040279040