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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 445 |
| 5 | 5266 |
| 6 | 77258 |
| 7 | 1349554 |
| 8 | 27306462 |
| 9 | 627568355 |
| 10 | 16142172173 |
| 11 | 459332766227 |
| 12 | 14324480721391 |
| 13 | 485783513552956 |
| 14 | 17798331858727376 |
| 15 | 700589353757045796 |
| 16 | 29484907446960975744 |
| 17 | 1321168518044435497005 |
| 18 | 62795290373559355285155 |
| 19 | 3155553461189975793914005 |
[1,7,49,445,5266,77258,1349554,27306462,627568355, 16142172173,459332766227,14324480721391, 485783513552956,17798331858727376, 700589353757045796,29484907446960975744, 1321168518044435497005,62795290373559355285155, 3155553461189975793914005] |