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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 128 |
| 4 | 3128 |
| 5 | 103464 |
| 6 | 4327376 |
| 7 | 219132416 |
| 8 | 13037220864 |
| 9 | 891482661120 |
| 10 | 68898795919872 |
| 11 | 5939542370104320 |
| 12 | 565085390314014720 |
| 13 | 58814874313859198976 |
| 14 | 6647869870080852418560 |
| 15 | 810941992663677532667904 |
| 16 | 106188636284967568536207360 |
| 17 | 14856670240947944840012857344 |
[1,1,8,128,3128,103464,4327376,219132416, 13037220864,891482661120,68898795919872, 5939542370104320,565085390314014720, 58814874313859198976,6647869870080852418560, 810941992663677532667904, 106188636284967568536207360, 14856670240947944840012857344] |