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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 23 |
| 5 | 40 |
| 6 | 68 |
| 7 | 108 |
| 8 | 167 |
| 9 | 241 |
| 10 | 345 |
| 11 | 482 |
| 12 | 653 |
| 13 | 869 |
| 14 | 1153 |
| 15 | 1502 |
| 16 | 1930 |
| 17 | 2454 |
| 18 | 3106 |
| 19 | 3896 |
[1,4,10,23,40,68,108,167,241,345,482,653,869,1153, 1502,1930,2454,3106,3896] |