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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 80 |
| 4 | 2690 |
| 5 | 155074 |
| 6 | 13658386 |
| 7 | 1706098008 |
| 8 | 286888266696 |
| 9 | 62485391828448 |
| 10 | 17112247116585744 |
| 11 | 5755236604915060944 |
| 12 | 2331975856351260982848 |
| 13 | 1120439648590390138640304 |
| 14 | 629855675998212293917375344 |
| 15 | 409557081242059531918330384896 |
[0,1,5,80,2690,155074,13658386,1706098008, 286888266696,62485391828448,17112247116585744, 5755236604915060944,2331975856351260982848, 1120439648590390138640304, 629855675998212293917375344, 409557081242059531918330384896] |