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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 336 |
| 4 | 2279 |
| 5 | 15307 |
| 6 | 101999 |
| 7 | 675151 |
| 8 | 4443665 |
| 9 | 29104549 |
| 10 | 189818232 |
| 11 | 1233390075 |
| 12 | 7987992466 |
| 13 | 51583193592 |
| 14 | 332235953819 |
| 15 | 2134851774996 |
| 16 | 13688959603199 |
| 17 | 87607353750867 |
| 18 | 559696980939927 |
| 19 | 3570042462583517 |
| 20 | 22738396298175560 |
[7,49,336,2279,15307,101999,675151,4443665, 29104549,189818232,1233390075,7987992466, 51583193592,332235953819,2134851774996, 13688959603199,87607353750867,559696980939927, 3570042462583517,22738396298175560] |