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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 49 |
| 4 | 219 |
| 5 | 666 |
| 6 | 1636 |
| 7 | 3499 |
| 8 | 6783 |
| 9 | 12212 |
| 10 | 20748 |
| 11 | 33637 |
| 12 | 52459 |
| 13 | 79182 |
| 14 | 116220 |
| 15 | 166495 |
| 16 | 233503 |
| 17 | 321384 |
| 18 | 434996 |
| 19 | 579993 |
| 20 | 762907 |
| 21 | 991234 |
| 22 | 1273524 |
| 23 | 1619475 |
| 24 | 2040031 |
| 25 | 2547484 |
| 26 | 3155580 |
| 27 | 3879629 |
| 28 | 4736619 |
| 29 | 5745334 |
| 30 | 6926476 |
| 31 | 8302791 |
| 32 | 9899199 |
[0,4,49,219,666,1636,3499,6783,12212,20748,33637, 52459,79182,116220,166495,233503,321384,434996, 579993,762907,991234,1273524,1619475,2040031, 2547484,3155580,3879629,4736619,5745334,6926476, 8302791,9899199] |