# A007229 (b-file synthesized from sequence entry)
2 38
3 264
4 2016
5 15504
6 122661
7 986700
8 8064576
9 66756144
10 558689224
11 4719593312
12 40193414112
13 344721646640
14 2974925353455
15 25814778578820
16 225105551191680
17 1971557711151600
18 17336058626562984
19 152984380665537760