# A004358 (b-file synthesized from sequence entry)
3 1
4 24
5 435
6 7140
7 111930
8 1712304
9 25827165
10 386206920
11 5743572120
12 85113005120
13 1258315963905
14 18574174153080
15 273897571557780
16 4036320536972640
17 59458448728028700
18 875691012480893280