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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 22 |
| 5 | 54 |
| 6 | 212 |
| 7 | 601 |
| 8 | 2419 |
| 9 | 7391 |
| 10 | 30803 |
| 11 | 98465 |
| 12 | 417611 |
| 13 | 1395410 |
| 14 | 5971378 |
| 15 | 20544578 |
| 16 | 89140376 |
| 17 | 313095273 |
| 18 | 1369580635 |
| 19 | 4915365432 |
| 20 | 21606796900 |
| 21 | 78780031560 |
| 22 | 348839361590 |
| 23 | 1287433990354 |
| 24 | 5727956844064 |
| 25 | 21411645040075 |
| 26 | 95567296894415 |
| 27 | 360823463864898 |
| 28 | 1617709647340616 |
| 29 | 6157502753266494 |
[1,1,3,6,22,54,212,601,2419,7391,30803,98465, 417611,1395410,5971378,20544578,89140376, 313095273,1369580635,4915365432,21606796900, 78780031560,348839361590,1287433990354, 5727956844064,21411645040075,95567296894415, 360823463864898,1617709647340616,6157502753266494] |