# A148995 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 117
6 453
7 1775
8 7112
9 28983
10 120132
11 504174
12 2146646
13 9208343
14 39778905
15 173078627
16 757217899
17 3328960216
18 14708426707
19 65283892983
20 291015312216
21 1302008131740
22 5842963924992
23 26296807422445
24 118666236830752
25 536772492146077
26 2433653602795155
27 11058875016376168
28 50361354298500484