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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 18 |
| 3 | 60 |
| 4 | 140 |
| 5 | 270 |
| 6 | 462 |
| 7 | 728 |
| 8 | 1080 |
| 9 | 1530 |
| 10 | 2090 |
| 11 | 2772 |
| 12 | 3588 |
| 13 | 4550 |
| 14 | 5670 |
| 15 | 6960 |
| 16 | 8432 |
| 17 | 10098 |
| 18 | 11970 |
| 19 | 14060 |
| 20 | 16380 |
| 21 | 18942 |
| 22 | 21758 |
| 23 | 24840 |
| 24 | 28200 |
| 25 | 31850 |
| 26 | 35802 |
| 27 | 40068 |
| 28 | 44660 |
| 29 | 49590 |
| 30 | 54870 |
| 31 | 60512 |
| 32 | 66528 |
| 33 | 72930 |
| 34 | 79730 |
| 35 | 86940 |
| 36 | 94572 |
| 37 | 102638 |
| 38 | 111150 |
| 39 | 120120 |
| 40 | 129560 |
| 41 | 139482 |
[2,18,60,140,270,462,728,1080,1530,2090,2772,3588, 4550,5670,6960,8432,10098,11970,14060,16380,18942, 21758,24840,28200,31850,35802,40068,44660,49590, 54870,60512,66528,72930,79730,86940,94572,102638, 111150,120120,129560,139482] |