# A149335 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 40
5 147
6 547
7 2103
8 8259
9 32941
10 133800
11 548559
12 2272771
13 9512677
14 40082150
15 170135424
16 726604441
17 3119329612
18 13462273830
19 58348311884
20 253930572928
21 1109372881912
22 4862659777279
23 21383504349494
24 94310080465112
25 417063476801472
26 1849153300144679
27 8217891583274923