# A081097 (b-file synthesized from sequence entry)
1 1
2 6
3 23
4 40
5 273
6 1870
7 7343
8 12816
9 87841
10 602070
11 2364359
12 4126648
13 28284465
14 193864606
15 761316191
16 1328767776
17 9107509825
18 62423800998
19 245141449079
20 427859097160
21 2932589879121
22 20100270056686
23 78934785287183