# A120471 (b-file synthesized from sequence entry)
0 0
1 6
2 12
3 42
4 120
5 366
6 1092
7 3282
8 9840
9 29526
10 88572
11 265722
12 797160
13 2391486
14 7174452
15 21523362
16 64570080
17 193710246
18 581130732
19 1743392202
20 5230176600
21 15690529806
22 47071589412
23 141214768242
24 423644304720
25 1270932914166