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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 33 |
| 3 | 225 |
| 4 | 1302 |
| 5 | 5950 |
| 6 | 23946 |
| 7 | 88110 |
| 8 | 303739 |
| 9 | 996299 |
| 10 | 3134799 |
| 11 | 9509576 |
| 12 | 27911314 |
| 13 | 79482488 |
| 14 | 220049935 |
| 15 | 593073991 |
| 16 | 1557365893 |
| 17 | 3986731613 |
| 18 | 9954711223 |
| 19 | 24261060624 |
| 20 | 57756733037 |
| 21 | 134430995512 |
| 22 | 306213956668 |
| 23 | 683311240461 |
[15,33,225,1302,5950,23946,88110,303739,996299, 3134799,9509576,27911314,79482488,220049935, 593073991,1557365893,3986731613,9954711223, 24261060624,57756733037,134430995512,306213956668, 683311240461] |