# A149611 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 15
4 63
5 239
6 1011
7 4189
8 18057
9 77893
10 341857
11 1507917
12 6713433
13 30039549
14 135215513
15 611198839
16 2774510515
17 12637593187
18 57749756479
19 264625723379
20 1215708590859
21 5597697967779
22 25828427689907
23 119400088500319
24 552925785793747
25 2564597556922403
26 11912703626624975
27 55410318800011595