# A126902 (b-file synthesized from sequence entry)
0 1
1 21
2 231
3 1764
4 10479
5 51450
6 216531
7 800121
8 2642514
9 7913619
10 21754425
11 55475826
12 132425181
13 298205544
14 637710549
15 1302463575
16 2553071556
17 4823274561
18 8814149379
19 15629570544
20 26967111675
21 45382254246
22 74648134911
23 120238185669
24 189964987254
25 294815553375
26 450031184421
27 676489071006