# A149973 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 16
4 56
5 204
6 780
7 3099
8 12594
9 52123
10 219696
11 939511
12 4061334
13 17733255
14 78151761
15 347048149
16 1551225434
17 6976462330
18 31550130733
19 143365879422
20 654323444492
21 2998603009552
22 13792688901614
23 63654344411450
24 294688265919191
25 1368229743361834
26 6369561861745394
27 29725712375089444