# A149835 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 10
4 30
5 96
6 324
7 1138
8 4134
9 15464
10 59198
11 230678
12 913916
13 3672582
14 14940794
15 61426632
16 254982076
17 1067415522
18 4502824810
19 19124778850
20 81738521776
21 351324672662
22 1517933308038
23 6589522925548
24 28732010239624
25 125785366412276
26 552750320877912
27 2437456478786392
28 10783477702624244