# A009736 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 5
4 16
5 61
6 248
7 1217
8 6336
9 38137
10 242464
11 1753245
12 13219328
13 112141173
14 982066816
15 9583252569
16 95757641728
17 1057866255601
18 11884764271104
19 146689651631285
20 1830773338714112
21 24972471277262509