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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 30 |
| 5 | 98 |
| 6 | 385 |
| 7 | 1421 |
| 8 | 5830 |
| 9 | 22734 |
| 10 | 96060 |
| 11 | 391011 |
| 12 | 1682527 |
| 13 | 7025828 |
| 14 | 30735068 |
| 15 | 131095245 |
| 16 | 579566727 |
| 17 | 2508794437 |
| 18 | 11201544301 |
| 19 | 49105011986 |
| 20 | 220777304176 |
| 21 | 977128722768 |
| 22 | 4421858790541 |
| 23 | 19734612156909 |
| 24 | 89745993232053 |
| 25 | 403206005346593 |
| 26 | 1842083670209570 |
| 27 | 8325004223278699 |
| 28 | 38172790900225366 |
[1,1,3,8,30,98,385,1421,5830,22734,96060,391011, 1682527,7025828,30735068,131095245,579566727, 2508794437,11201544301,49105011986,220777304176, 977128722768,4421858790541,19734612156909, 89745993232053,403206005346593,1842083670209570, 8325004223278699,38172790900225366] |