# A261788 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 12
4 30
5 81
6 224
7 626
8 1747
9 4909
10 13811
11 38934
12 109889
13 310666
14 880125
15 2500221
16 7125406
17 20376598
18 58472481
19 168349612
20 486198698