# A185634 (b-file synthesized from sequence entry)
2 1
3 2
4 21
5 204
6 2605
7 39990
8 720601
9 14913080
10 348678441
11 9090909090
12 261535698061
13 8230246567620
14 281241170407093
15 10371206370520814
16 410525522232055665
17 17361641481138401520
18 781282469559318055057
19 37275544492386193492506
20 1879498672877297909667781