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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 28 |
| 2 | 70 |
| 3 | 130 |
| 4 | 208 |
| 5 | 304 |
| 6 | 418 |
| 7 | 550 |
| 8 | 700 |
| 9 | 868 |
| 10 | 1054 |
| 11 | 1258 |
| 12 | 1480 |
| 13 | 1720 |
| 14 | 1978 |
| 15 | 2254 |
[4,28,70,130,208,304,418,550,700,868,1054,1258, 1480,1720,1978,2254] |