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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 36 |
| 3 | 120 |
| 4 | 330 |
| 5 | 792 |
| 6 | 1716 |
| 7 | 3431 |
| 8 | 6427 |
| 9 | 11404 |
| 10 | 19328 |
| 11 | 31494 |
| 12 | 49596 |
| 13 | 75804 |
| 14 | 112848 |
| 15 | 164109 |
| 16 | 233717 |
| 17 | 326656 |
| 18 | 448876 |
| 19 | 607412 |
| 20 | 810510 |
| 21 | 1067760 |
| 22 | 1390236 |
| 23 | 1790643 |
| 24 | 2283471 |
| 25 | 2885156 |
| 26 | 3614248 |
| 27 | 4491586 |
| 28 | 5540480 |
| 29 | 6786900 |
| 30 | 8259672 |
[1,8,36,120,330,792,1716,3431,6427,11404,19328, 31494,49596,75804,112848,164109,233717,326656, 448876,607412,810510,1067760,1390236,1790643, 2283471,2885156,3614248,4491586,5540480,6786900, 8259672] |