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| n | a(n) |
|---|---|
| 1 | 1515 |
| 2 | 1644 |
| 3 | 3980 |
| 4 | 9277 |
| 5 | 25197 |
| 6 | 76113 |
| 7 | 231372 |
| 8 | 698936 |
| 9 | 2121821 |
| 10 | 6483996 |
| 11 | 19881260 |
| 12 | 61024374 |
| 13 | 187473423 |
| 14 | 576442523 |
| 15 | 1773336035 |
| 16 | 5457204006 |
| 17 | 16797726720 |
| 18 | 51712080105 |
| 19 | 159214729408 |
| 20 | 490238324306 |
| 21 | 1509560349792 |
| 22 | 4648472850677 |
[1515,1644,3980,9277,25197,76113,231372,698936, 2121821,6483996,19881260,61024374,187473423, 576442523,1773336035,5457204006,16797726720, 51712080105,159214729408,490238324306, 1509560349792,4648472850677] |