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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 27 |
| 5 | 93 |
| 6 | 341 |
| 7 | 1295 |
| 8 | 5052 |
| 9 | 20209 |
| 10 | 82190 |
| 11 | 339801 |
| 12 | 1422276 |
| 13 | 6020724 |
| 14 | 25727971 |
| 15 | 110854465 |
| 16 | 481147223 |
| 17 | 2101771068 |
| 18 | 9234216691 |
| 19 | 40779355432 |
| 20 | 180925623756 |
| 21 | 806086402420 |
| 22 | 3605151047127 |
| 23 | 16180065798799 |
| 24 | 72849331715413 |
| 25 | 328964096764340 |
| 26 | 1489531226709228 |
| 27 | 6761473239089773 |
| 28 | 30764122078267794 |
[1,1,3,8,27,93,341,1295,5052,20209,82190,339801, 1422276,6020724,25727971,110854465,481147223, 2101771068,9234216691,40779355432,180925623756, 806086402420,3605151047127,16180065798799, 72849331715413,328964096764340,1489531226709228, 6761473239089773,30764122078267794] |