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| n | a(n) |
|---|---|
| 1 | 1260 |
| 2 | 9484 |
| 3 | 60232 |
| 4 | 408432 |
| 5 | 2699464 |
| 6 | 18021052 |
| 7 | 119835492 |
| 8 | 798096928 |
| 9 | 5312099836 |
| 10 | 35365379640 |
| 11 | 235424061980 |
| 12 | 1567252060568 |
| 13 | 10433278592944 |
| 14 | 69455257693892 |
| 15 | 462368804232804 |
| 16 | 3078026001264048 |
| 17 | 20490657892306776 |
| 18 | 136407916635389280 |
[1260,9484,60232,408432,2699464,18021052, 119835492,798096928,5312099836,35365379640, 235424061980,1567252060568,10433278592944, 69455257693892,462368804232804,3078026001264048, 20490657892306776,136407916635389280] |