# A072997 (b-file synthesized from sequence entry)
1 2
2 3
3 13
4 31
5 89
6 239
7 617
8 1571
9 4007
10 10141
11 25673
12 64853
13 163367
14 412007
15 1037759
16 2614369
17 6584857
18 16585291
19 41764859
20 105178831
21 264877933
22 667038311
23 1679809291
24 4230219377
25 10652786759
26 26826453991
27 67555877849