# A149412 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 52
5 200
6 906
7 3835
8 17835
9 79215
10 374381
11 1710234
12 8170299
13 38011835
14 182943410
15 862048941
16 4171224246
17 19838535950
18 96382566615
19 461629848142
20 2249821353330
21 10834620431069
22 52936934322254
23 256041710688572
24 1253562592466569
25 6084551109301534
26 29840382820005767
27 145261082306545356