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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 56 |
| 4 | 168 |
| 5 | 399 |
| 6 | 810 |
| 7 | 1480 |
| 8 | 2496 |
| 9 | 3965 |
| 10 | 6000 |
| 11 | 8736 |
| 12 | 12312 |
| 13 | 16891 |
| 14 | 22638 |
| 15 | 29744 |
| 16 | 38400 |
| 17 | 48825 |
| 18 | 61236 |
| 19 | 75880 |
| 20 | 93000 |
| 21 | 112871 |
| 22 | 135762 |
| 23 | 161976 |
| 24 | 191808 |
| 25 | 225589 |
| 26 | 263640 |
| 27 | 306320 |
| 28 | 353976 |
| 29 | 406995 |
| 30 | 465750 |
| 31 | 530656 |
| 32 | 602112 |
| 33 | 680561 |
| 34 | 766428 |
[0,1,12,56,168,399,810,1480,2496,3965,6000,8736, 12312,16891,22638,29744,38400,48825,61236,75880, 93000,112871,135762,161976,191808,225589,263640, 306320,353976,406995,465750,530656,602112,680561, 766428] |