# A149571 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 13
4 63
5 203
6 999
7 3587
8 17691
9 67419
10 333565
11 1322809
12 6556223
13 26731127
14 132674229
15 552239801
16 2743793869
17 11604068827
18 57702655875
19 247148185971
20 1229798067359
21 5321999057913
22 26496615787301
23 115650961290621
24 576055726075373
25 2532553343278171
26 12619514860678161
27 55823435028402645