# A181140 (b-file synthesized from sequence entry)
1 3
2 9
3 27
4 81
5 240
6 714
7 2124
8 6318
9 18792
10 55896
11 166260
12 494532
13 1470960
14 4375296
15 13014096
16 38709768
17 115140240
18 342478800
19 1018685808
20 3030029232
21 9012668160
22 26807724000
23 79738214400
24 237177271584
25 705471756288
26 2098389932544