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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 144 |
| 3 | 2268 |
| 4 | 18688 |
| 5 | 78750 |
| 6 | 326592 |
| 7 | 825944 |
| 8 | 2396160 |
| 9 | 4966677 |
| 10 | 11340000 |
| 11 | 19501812 |
| 12 | 42384384 |
| 13 | 62777078 |
| 14 | 118935936 |
| 15 | 178605000 |
| 16 | 306774016 |
| 17 | 410422194 |
| 18 | 715201488 |
| 19 | 894002060 |
| 20 | 1471680000 |
| 21 | 1873240992 |
| 22 | 2808260928 |
| 23 | 3405105288 |
| 24 | 5434490880 |
| 25 | 6152734375 |
| 26 | 9039899232 |
[0,1,144,2268,18688,78750,326592,825944,2396160, 4966677,11340000,19501812,42384384,62777078, 118935936,178605000,306774016,410422194,715201488, 894002060,1471680000,1873240992,2808260928, 3405105288,5434490880,6152734375,9039899232] |