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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 35 |
| 5 | 126 |
| 6 | 462 |
| 7 | 1716 |
| 8 | 6427 |
| 9 | 24229 |
| 10 | 91828 |
| 11 | 349570 |
| 12 | 1335698 |
| 13 | 5119856 |
| 14 | 19678452 |
| 15 | 75814560 |
| 16 | 292695291 |
| 17 | 1132074847 |
| 18 | 4385740683 |
| 19 | 17015510820 |
| 20 | 66102536360 |
| 21 | 257103599280 |
| 22 | 1001078753370 |
| 23 | 3901733646660 |
| 24 | 15220908863866 |
| 25 | 59427261280126 |
| 26 | 232201593611796 |
[1,1,3,10,35,126,462,1716,6427,24229,91828,349570, 1335698,5119856,19678452,75814560,292695291, 1132074847,4385740683,17015510820,66102536360, 257103599280,1001078753370,3901733646660, 15220908863866,59427261280126,232201593611796] |