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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 33 |
| 3 | 88 |
| 4 | 175 |
| 5 | 1127 |
| 6 | 3465 |
| 7 | 7029 |
| 8 | 36659 |
| 9 | 1755164 |
| 10 | 4900901 |
| 11 | 537252430 |
| 12 | 816292168 |
| 13 | 1365815759 |
| 14 | 2048921480 |
| 15 | 11937573274 |
| 16 | 14434878293 |
| 17 | 17435497255 |
| 18 | 27826547235 |
| 19 | 169697066625 |
| 20 | 371707331522 |
| 21 | 405119159125 |
| 22 | 800760189610 |
| 23 | 23737435535625 |
| 24 | 86561181062463 |
| 25 | 100528900924040 |
[15,33,88,175,1127,3465,7029,36659,1755164, 4900901,537252430,816292168,1365815759,2048921480, 11937573274,14434878293,17435497255,27826547235, 169697066625,371707331522,405119159125, 800760189610,23737435535625,86561181062463, 100528900924040] |