# A051669 (b-file synthesized from sequence entry)
0 1
1 8
2 26
3 66
4 150
5 322
6 670
7 1370
8 2774
9 5586
10 11214
11 22474
12 44998
13 90050
14 180158
15 360378
16 720822
17 1441714
18 2883502
19 5767082
20 11534246
21 23068578
22 46137246
23 92274586
24 184549270
25 369098642
26 738197390
27 1476394890
28 2952789894