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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 440 |
| 4 | 2898 |
| 5 | 11756 |
| 6 | 36864 |
| 7 | 95832 |
| 8 | 219092 |
| 9 | 452368 |
| 10 | 864810 |
| 11 | 1551080 |
| 12 | 2642774 |
| 13 | 4310012 |
| 14 | 6776612 |
| 15 | 10320160 |
| 16 | 15292160 |
| 17 | 22115896 |
| 18 | 31311374 |
| 19 | 43491392 |
| 20 | 59391706 |
| 21 | 79863756 |
| 22 | 105911744 |
| 23 | 138681424 |
| 24 | 179503444 |
| 25 | 229878952 |
| 26 | 291529666 |
| 27 | 366378408 |
[0,30,440,2898,11756,36864,95832,219092,452368, 864810,1551080,2642774,4310012,6776612,10320160, 15292160,22115896,31311374,43491392,59391706, 79863756,105911744,138681424,179503444,229878952, 291529666,366378408] |