# A027281 (b-file synthesized from sequence entry)
0 1
1 6
2 21
3 76
4 235
5 738
6 2177
7 6424
8 18423
9 52590
10 147917
11 413796
12 1147523
13 3166842
14 8689305
15 23745584
16 64621199
17 175277574
18 473909989
19 1277864060
20 3436938267
21 9223203858
22 24699503281
23 66020102472
24 176160084775
25 469293598878