# A005569 (b-file synthesized from sequence entry)
1 4
2 34
3 308
4 3024
5 31680
6 349206
7 4008004
8 47530912
9 579058896
10 7215393640
11 91644262864
12 1183274479040
13 15497363512800
14 205519758825150
15 2755739674246500
16 37314861293793600
17 509727100259638800