# A151371 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 4
4 16
5 64
6 266
7 1210
8 5630
9 27338
10 136182
11 695270
12 3622134
13 19202912
14 103375978
15 564014502
16 3114100008
17 17377324802
18 97897946434
19 556290574936
20 3185821992528
21 18375238184570
22 106677854854822
23 623039452424644
24 3658928077976048
25 21597785683494184
26 128091748188993146
27 763037745974345554