# A149180 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 10
4 36
5 119
6 453
7 1691
8 6640
9 26444
10 107761
11 445570
12 1866616
13 7916881
14 33923740
15 146666902
16 639199703
17 2805469930
18 12395141339
19 55081556226
20 246070109241
21 1104581807481
22 4980421002183
23 22548365703429
24 102469842575184
25 467289169399463
26 2137858084475851
27 9810302922185990