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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 15 |
| 3 | 43 |
| 4 | 88 |
| 5 | 164 |
| 6 | 267 |
| 7 | 415 |
| 8 | 600 |
| 9 | 844 |
| 10 | 1135 |
| 11 | 1499 |
| 12 | 1920 |
| 13 | 2428 |
| 14 | 3003 |
| 15 | 3679 |
| 16 | 4432 |
| 17 | 5300 |
| 18 | 6255 |
| 19 | 7339 |
| 20 | 8520 |
| 21 | 9844 |
| 22 | 11275 |
| 23 | 12863 |
| 24 | 14568 |
| 25 | 16444 |
| 26 | 18447 |
| 27 | 20635 |
| 28 | 22960 |
| 29 | 25484 |
| 30 | 28155 |
| 31 | 31039 |
| 32 | 34080 |
| 33 | 37348 |
| 34 | 40783 |
| 35 | 44459 |
| 36 | 48312 |
| 37 | 52420 |
| 38 | 56715 |
[0,4,15,43,88,164,267,415,600,844,1135,1499,1920, 2428,3003,3679,4432,5300,6255,7339,8520,9844, 11275,12863,14568,16444,18447,20635,22960,25484, 28155,31039,34080,37348,40783,44459,48312,52420, 56715] |