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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 38 |
| 3 | 496 |
| 4 | 6731 |
| 5 | 93378 |
| 6 | 1302087 |
| 7 | 18221996 |
| 8 | 255080336 |
| 9 | 3571083234 |
| 10 | 49994778319 |
| 11 | 699925682414 |
| 12 | 9798949321655 |
| 13 | 137185276830144 |
| 14 | 1920593788732430 |
| 15 | 26888312935819112 |
| 16 | 376436379758582067 |
| 17 | 5270109313747856290 |
[4,38,496,6731,93378,1302087,18221996,255080336, 3571083234,49994778319,699925682414,9798949321655, 137185276830144,1920593788732430, 26888312935819112,376436379758582067, 5270109313747856290] |