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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 19 |
| 5 | 36 |
| 6 | 75 |
| 7 | 80 |
| 8 | 118 |
| 9 | 199 |
| 10 | 336 |
| 11 | 360 |
| 12 | 520 |
| 13 | 1282 |
| 14 | 1810 |
| 15 | 2872 |
| 16 | 4870 |
| 17 | 14467 |
| 18 | 15102 |
| 19 | 22499 |
| 20 | 24675 |
| 21 | 45615 |
| 22 | 105648 |
| 23 | 116432 |
[3,6,15,19,36,75,80,118,199,336,360,520,1282,1810, 2872,4870,14467,15102,22499,24675,45615,105648, 116432] |