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| n | a(n) |
|---|---|
| 4 | 16 |
| 5 | 31 |
| 6 | 60 |
| 7 | 118 |
| 8 | 230 |
| 9 | 436 |
| 10 | 810 |
| 11 | 1450 |
| 12 | 2520 |
| 13 | 4256 |
| 14 | 6990 |
| 15 | 11176 |
| 16 | 17486 |
| 17 | 26731 |
| 18 | 40080 |
| 19 | 58985 |
| 20 | 85376 |
[16,31,60,118,230,436,810,1450,2520,4256,6990, 11176,17486,26731,40080,58985,85376] |