# A006779 (b-file synthesized from sequence entry)
0 1
1 6
2 18
3 54
4 150
5 426
6 1158
7 3204
8 8682
9 23724
10 64194
11 174378
12 470856
13 1274430
14 3434826
15 9272346
16 24953004
17 67230288
18 180705126
19 486152604
20 1305430884
21 3507947838
22 9412114986
23 25268587338
24 67752451146
25 181754458194
26 487060621596
27 1305761069730
28 3497441209182