# A046631 (b-file synthesized from sequence entry)
0 1
1 3
2 3
3 7
4 21
5 57
6 169
7 507
8 1515
9 4543
10 13629
11 40881
12 122641
13 367923
14 1103763
15 3311287
16 9933861
17 29801577
18 89404729
19 268214187
20 804642555
21 2413927663
22 7241782989
23 21725348961
24 65176046881
25 195528140643
26 586584421923