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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 39 |
| 3 | 346 |
| 4 | 3230 |
| 5 | 31191 |
| 6 | 309175 |
| 7 | 3129194 |
| 8 | 32211432 |
| 9 | 336239668 |
| 10 | 3551081432 |
| 11 | 37876866618 |
| 12 | 407453687104 |
| 13 | 4415521127579 |
| 14 | 48159808659879 |
| 15 | 528270329593474 |
| 16 | 5823991858003544 |
| 17 | 64497989461609224 |
| 18 | 717191431082458804 |
[1,5,39,346,3230,31191,309175,3129194,32211432, 336239668,3551081432,37876866618,407453687104, 4415521127579,48159808659879,528270329593474, 5823991858003544,64497989461609224, 717191431082458804] |