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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 45 |
| 2 | 118 |
| 3 | 257 |
| 4 | 522 |
| 5 | 975 |
| 6 | 1752 |
| 7 | 2998 |
| 8 | 4987 |
| 9 | 8043 |
| 10 | 12693 |
| 11 | 19584 |
| 12 | 29719 |
| 13 | 44324 |
| 14 | 65210 |
| 15 | 94642 |
| 16 | 135805 |
| 17 | 192699 |
| 18 | 270822 |
| 19 | 377048 |
| 20 | 520624 |
| 21 | 713123 |
| 22 | 969784 |
| 23 | 1309646 |
| 24 | 1757447 |
| 25 | 2343931 |
| 26 | 3108553 |
| 27 | 4100220 |
| 28 | 5380964 |
| 29 | 7027376 |
| 30 | 9135769 |
| 31 | 11824507 |
[15,45,118,257,522,975,1752,2998,4987,8043,12693, 19584,29719,44324,65210,94642,135805,192699, 270822,377048,520624,713123,969784,1309646, 1757447,2343931,3108553,4100220,5380964,7027376, 9135769,11824507] |