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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 12 |
| 4 | 20 |
| 5 | 36 |
| 6 | 60 |
| 7 | 88 |
| 8 | 132 |
| 9 | 196 |
| 10 | 280 |
| 11 | 396 |
| 12 | 552 |
| 13 | 748 |
| 14 | 1020 |
| 15 | 1368 |
| 16 | 1800 |
| 17 | 2376 |
| 18 | 3096 |
| 19 | 4004 |
| 20 | 5160 |
| 21 | 6600 |
| 22 | 8372 |
| 23 | 10584 |
| 24 | 13320 |
| 25 | 16652 |
| 26 | 20760 |
| 27 | 25764 |
| 28 | 31824 |
| 29 | 39204 |
| 30 | 48120 |
| 31 | 58800 |
| 32 | 71688 |
| 33 | 87120 |
| 34 | 105520 |
| 35 | 127512 |
| 36 | 153640 |
| 37 | 184628 |
| 38 | 221364 |
| 39 | 264792 |
| 40 | 315920 |
[2,6,12,20,36,60,88,132,196,280,396,552,748,1020, 1368,1800,2376,3096,4004,5160,6600,8372,10584, 13320,16652,20760,25764,31824,39204,48120,58800, 71688,87120,105520,127512,153640,184628,221364, 264792,315920] |