n | a(n) |
---|---|
6 | 1 |
7 | 2 |
8 | 8 |
9 | 23 |
10 | 74 |
11 | 220 |
12 | 674 |
13 | 2011 |
14 | 6038 |
15 | 17980 |
16 | 53547 |
17 | 158907 |
18 | 471225 |
19 | 1394786 |
20 | 4124929 |
21 | 12185636 |
22 | 35972082 |
23 | 106111713 |
24 | 312835608 |
25 | 921809509 |
26 | 2715058701 |
27 | 7993741597 |
28 | 23527694230 |
29 | 69228383367 |
30 | 203648980297 |
31 | 598945442071 |
[1,2,8,23,74,220,674,2011,6038,17980,53547,158907, 471225,1394786,4124929,12185636,35972082, 106111713,312835608,921809509,2715058701, 7993741597,23527694230,69228383367,203648980297, 598945442071] |