# A049158 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 11
4 43
5 181
6 799
7 3643
8 17033
9 81225
10 393515
11 1931463
12 9583895
13 47996913
14 242290399
15 1231566327
16 6298089417
17 32380551185
18 167274293923
19 867817932515
20 4519592287323
21 23620211300653
22 123835755998367
23 651129774621811