# A083591 (b-file synthesized from sequence entry)
0 1
1 3
2 9
3 27
4 82
5 242
6 736
7 2188
8 6600
9 19736
10 59328
11 177744
12 533728
13 1600160
14 4802560
15 14403520
16 43218816
17 129640064
18 388952832
19 1166793216
20 3500510464
21 10501269248
22 31504332544
23 94511948032
24 283537942272
25 850609632512