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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 26 |
| 3 | 2704 |
| 4 | 698568 |
| 5 | 384890688 |
| 6 | 378771904512 |
| 7 | 597991783196160 |
| 8 | 1450380828625459200 |
| 9 | 5077825865646165964800 |
| 10 | 24487520383436615392204800 |
[1,1,26,2704,698568,384890688,378771904512, 597991783196160,1450380828625459200, 5077825865646165964800,24487520383436615392204800] |