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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 298 |
| 5 | 3207 |
| 6 | 40947 |
| 7 | 605076 |
| 8 | 10157220 |
| 9 | 190915965 |
| 10 | 3971997585 |
| 11 | 90613969110 |
| 12 | 2249113016430 |
| 13 | 60338869272675 |
| 14 | 1739831420490975 |
| 15 | 53656981894391400 |
| 16 | 1762410972384203400 |
| 17 | 61421841416041392825 |
| 18 | 2263752327235180060125 |
| 19 | 87970054921758957890250 |
[1,5,34,298,3207,40947,605076,10157220,190915965, 3971997585,90613969110,2249113016430, 60338869272675,1739831420490975,53656981894391400, 1762410972384203400,61421841416041392825, 2263752327235180060125,87970054921758957890250] |