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| n | a(n) |
|---|---|
| 1 | 760 |
| 2 | 4024 |
| 3 | 20404 |
| 4 | 115924 |
| 5 | 625480 |
| 6 | 3640580 |
| 7 | 19965444 |
| 8 | 117487100 |
| 9 | 648180128 |
| 10 | 3842929120 |
| 11 | 21274493964 |
| 12 | 126918950864 |
| 13 | 704449207500 |
| 14 | 4225296177556 |
| 15 | 23502462471760 |
| 16 | 141626870060880 |
| 17 | 789204770612276 |
| 18 | 4774795329104980 |
[760,4024,20404,115924,625480,3640580,19965444, 117487100,648180128,3842929120,21274493964, 126918950864,704449207500,4225296177556, 23502462471760,141626870060880,789204770612276, 4774795329104980] |