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| n | a(n) |
|---|---|
| 1 | 45 |
| 2 | 420 |
| 3 | 19047 |
| 4 | 44467 |
| 5 | 92681 |
| 6 | 316227 |
| 7 | 2012353 |
| 8 | 8016758 |
| 9 | 14310835 |
| 10 | 60583368 |
| 11 | 91068707 |
| 12 | 189812531 |
| 13 | 488438379 |
| 14 | 2741690265 |
| 15 | 6023263700 |
| 16 | 23751934582 |
| 17 | 771834189385 |
| 18 | 1734606819630 |
| 19 | 8034176335637 |
| 20 | 11511075516802 |
| 21 | 22632960587688 |
[45,420,19047,44467,92681,316227,2012353,8016758, 14310835,60583368,91068707,189812531,488438379, 2741690265,6023263700,23751934582,771834189385, 1734606819630,8034176335637,11511075516802, 22632960587688] |