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| n | a(n) |
|---|---|
| 1 | 2430 |
| 2 | 11880 |
| 3 | 44550 |
| 4 | 138996 |
| 5 | 378378 |
| 6 | 926640 |
| 7 | 2084940 |
| 8 | 4375800 |
| 9 | 8664084 |
| 10 | 16325712 |
| 11 | 29476980 |
| 12 | 51279480 |
| 13 | 86337900 |
| 14 | 141210432 |
| 15 | 225054126 |
| 16 | 350430300 |
| 17 | 534298050 |
| 18 | 799227000 |
| 19 | 1174863690 |
| 20 | 1699689420 |
| 21 | 2423110950 |
| 22 | 3407929200 |
| 23 | 4733235000 |
| 24 | 6497785008 |
| 25 | 8823915144 |
| 26 | 11862053280 |
| 27 | 15795897480 |
| 28 | 20848330800 |
[2430,11880,44550,138996,378378,926640,2084940, 4375800,8664084,16325712,29476980,51279480, 86337900,141210432,225054126,350430300,534298050, 799227000,1174863690,1699689420,2423110950, 3407929200,4733235000,6497785008,8823915144, 11862053280,15795897480,20848330800] |