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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 50 |
| 3 | 135 |
| 4 | 670 |
| 5 | 1087 |
| 6 | 3383 |
| 7 | 6814 |
| 8 | 13843 |
| 9 | 20012 |
| 10 | 37643 |
| 11 | 50271 |
| 12 | 84258 |
| 13 | 124243 |
| 14 | 185263 |
| 15 | 233753 |
| 16 | 347471 |
| 17 | 423430 |
| 18 | 594001 |
| 19 | 776949 |
| 20 | 1021618 |
| 21 | 1205883 |
| 22 | 1612046 |
| 23 | 2004761 |
| 24 | 2549617 |
| 25 | 3112664 |
| 26 | 3856074 |
| 27 | 4411319 |
| 28 | 5541449 |
| 29 | 6253712 |
| 30 | 7547845 |
| 31 | 8918038 |
[4,50,135,670,1087,3383,6814,13843,20012,37643, 50271,84258,124243,185263,233753,347471,423430, 594001,776949,1021618,1205883,1612046,2004761, 2549617,3112664,3856074,4411319,5541449,6253712, 7547845,8918038] |