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| n | a(n) |
|---|---|
| 2 | 15 |
| 3 | 160 |
| 4 | 830 |
| 5 | 2976 |
| 6 | 8477 |
| 7 | 20608 |
| 8 | 44604 |
| 9 | 88320 |
| 10 | 162987 |
| 11 | 284064 |
| 12 | 472186 |
| 13 | 754208 |
| 14 | 1164345 |
| 15 | 1745408 |
| 16 | 2550136 |
| 17 | 3642624 |
| 18 | 5099847 |
| 19 | 7013280 |
| 20 | 9490614 |
| 21 | 12657568 |
| 22 | 16659797 |
| 23 | 21664896 |
| 24 | 27864500 |
| 25 | 35476480 |
| 26 | 44747235 |
| 27 | 55954080 |
| 28 | 69407730 |
[15,160,830,2976,8477,20608,44604,88320,162987, 284064,472186,754208,1164345,1745408,2550136, 3642624,5099847,7013280,9490614,12657568,16659797, 21664896,27864500,35476480,44747235,55954080, 69407730] |