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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 5 |
| 3 | 65 |
| 4 | 306 |
| 5 | 975 |
| 6 | 2479 |
| 7 | 5425 |
| 8 | 10660 |
| 9 | 19311 |
| 10 | 32825 |
| 11 | 53009 |
| 12 | 82070 |
| 13 | 122655 |
| 14 | 177891 |
| 15 | 251425 |
| 16 | 347464 |
| 17 | 470815 |
| 18 | 626925 |
| 19 | 821921 |
| 20 | 1062650 |
| 21 | 1356719 |
| 22 | 1712535 |
| 23 | 2139345 |
| 24 | 2647276 |
| 25 | 3247375 |
| 26 | 3951649 |
| 27 | 4773105 |
| 28 | 5725790 |
| 29 | 6824831 |
| 30 | 8086475 |
| 31 | 9528129 |
[-1,5,65,306,975,2479,5425,10660,19311,32825, 53009,82070,122655,177891,251425,347464,470815, 626925,821921,1062650,1356719,1712535,2139345, 2647276,3247375,3951649,4773105,5725790,6824831, 8086475,9528129] |