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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 35 |
| 3 | 462 |
| 4 | 6435 |
| 5 | 92378 |
| 6 | 1352078 |
| 7 | 20058300 |
| 8 | 300540195 |
| 9 | 4537567650 |
| 10 | 68923264410 |
| 11 | 1052049481860 |
| 12 | 16123801841550 |
| 13 | 247959266474052 |
| 14 | 3824345300380220 |
| 15 | 59132290782430712 |
| 16 | 916312070471295267 |
| 17 | 14226520737620288370 |
[1,3,35,462,6435,92378,1352078,20058300,300540195, 4537567650,68923264410,1052049481860, 16123801841550,247959266474052,3824345300380220, 59132290782430712,916312070471295267, 14226520737620288370] |