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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 20 |
| 5 | 54 |
| 6 | 182 |
| 7 | 578 |
| 8 | 1994 |
| 9 | 6876 |
| 10 | 24510 |
| 11 | 88314 |
| 12 | 324753 |
| 13 | 1204362 |
| 14 | 4534353 |
| 15 | 17203317 |
| 16 | 65929875 |
| 17 | 254661075 |
| 18 | 990465401 |
| 19 | 3878886425 |
| 20 | 15278673944 |
| 21 | 60503855579 |
| 22 | 240843922447 |
| 23 | 962901535611 |
| 24 | 3866489329858 |
| 25 | 15586583179789 |
| 26 | 63056954545168 |
| 27 | 255992060288283 |
| 28 | 1042485185403142 |
| 29 | 4257970164969914 |
[1,1,3,6,20,54,182,578,1994,6876,24510,88314, 324753,1204362,4534353,17203317,65929875, 254661075,990465401,3878886425,15278673944, 60503855579,240843922447,962901535611, 3866489329858,15586583179789,63056954545168, 255992060288283,1042485185403142,4257970164969914] |