| n | a(n) |
|---|---|
| 0 | -2 |
| 1 | 4 |
| 2 | 6 |
| 3 | 10 |
| 4 | 20 |
| 5 | 30 |
| 6 | 42 |
| 7 | 68 |
| 8 | 96 |
| 9 | 130 |
| 10 | 188 |
| 11 | 258 |
| 12 | 350 |
| 13 | 474 |
| 14 | 624 |
| 15 | 826 |
| 16 | 1090 |
| 17 | 1410 |
| 18 | 1814 |
| 19 | 2338 |
| 20 | 2982 |
| 21 | 3774 |
| 22 | 4774 |
| 23 | 5994 |
| 24 | 7494 |
| 25 | 9348 |
| 26 | 11586 |
| 27 | 14320 |
| 28 | 17654 |
| 29 | 21654 |
| 30 | 26488 |
| 31 | 32334 |
| 32 | 39324 |
| 33 | 47680 |
| 34 | 57688 |
| 35 | 69600 |
| 36 | 83760 |
| 37 | 100596 |
[-2,4,6,10,20,30,42,68,96,130,188,258,350,474,624, 826,1090,1410,1814,2338,2982,3774,4774,5994,7494, 9348,11586,14320,17654,21654,26488,32334,39324, 47680,57688,69600,83760,100596] |