# A049150 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 3
5 15
6 59
7 187
8 533
9 1541
10 4893
11 16797
12 58663
13 201347
14 679767
15 2294967
16 7850121
17 27247369
18 95375225
19 334643225
20 1174649611
21 4129971863
22 14570334995
23 51610458291
24 183436895645
25 653582527693
26 2333035219285
27 8342630973365