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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 34 |
| 5 | 129 |
| 6 | 502 |
| 7 | 2032 |
| 8 | 8462 |
| 9 | 35852 |
| 10 | 154565 |
| 11 | 675899 |
| 12 | 2987199 |
| 13 | 13340857 |
| 14 | 60068598 |
| 15 | 272467777 |
| 16 | 1243944728 |
| 17 | 5710995281 |
| 18 | 26354122717 |
| 19 | 122157252775 |
| 20 | 568553772397 |
| 21 | 2655883548577 |
| 22 | 12447898038513 |
| 23 | 58520081537723 |
| 24 | 275877728447581 |
| 25 | 1303890813173164 |
| 26 | 6177081403785151 |
| 27 | 29327215806292682 |
[1,1,3,10,34,129,502,2032,8462,35852,154565, 675899,2987199,13340857,60068598,272467777, 1243944728,5710995281,26354122717,122157252775, 568553772397,2655883548577,12447898038513, 58520081537723,275877728447581,1303890813173164, 6177081403785151,29327215806292682] |