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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 144 |
| 3 | 1944 |
| 4 | 12800 |
| 5 | 56250 |
| 6 | 190512 |
| 7 | 537824 |
| 8 | 1327104 |
| 9 | 2952450 |
| 10 | 6050000 |
| 11 | 11595672 |
| 12 | 21026304 |
| 13 | 36386714 |
| 14 | 60505200 |
| 15 | 97200000 |
| 16 | 151519232 |
| 17 | 230016834 |
| 18 | 341067024 |
| 19 | 495219800 |
| 20 | 705600000 |
| 21 | 988352442 |
| 22 | 1363135664 |
| 23 | 1853666784 |
[0,2,144,1944,12800,56250,190512,537824,1327104, 2952450,6050000,11595672,21026304,36386714, 60505200,97200000,151519232,230016834,341067024, 495219800,705600000,988352442,1363135664, 1853666784] |