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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 122 |
| 4 | 1678 |
| 5 | 8708 |
| 6 | 31888 |
| 7 | 87237 |
| 8 | 211421 |
| 9 | 446696 |
| 10 | 870716 |
| 11 | 1576708 |
| 12 | 2718854 |
| 13 | 4439585 |
| 14 | 7025582 |
| 15 | 10718165 |
| 16 | 15900659 |
| 17 | 23007806 |
| 18 | 32631672 |
| 19 | 45287113 |
| 20 | 61897265 |
| 21 | 83153605 |
| 22 | 110234586 |
| 23 | 144275841 |
| 24 | 186746768 |
| 25 | 238863948 |
| 26 | 302821142 |
| 27 | 380334101 |
[0,3,122,1678,8708,31888,87237,211421,446696, 870716,1576708,2718854,4439585,7025582,10718165, 15900659,23007806,32631672,45287113,61897265, 83153605,110234586,144275841,186746768,238863948, 302821142,380334101] |