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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 100 |
| 3 | 1500 |
| 4 | 24846 |
| 5 | 438064 |
| 6 | 8062518 |
| 7 | 153117320 |
| 8 | 2978260865 |
| 9 | 59031215508 |
| 10 | 1187987779084 |
| 11 | 24210092837648 |
| 12 | 498606095949315 |
| 13 | 10361291534825800 |
| 14 | 216982960825089730 |
| 15 | 4574651332139656108 |
| 16 | 97018731642209493810 |
| 17 | 2068350691029593934000 |
| 18 | 44301394943232879298360 |
[1,8,100,1500,24846,438064,8062518,153117320, 2978260865,59031215508,1187987779084, 24210092837648,498606095949315,10361291534825800, 216982960825089730,4574651332139656108, 97018731642209493810,2068350691029593934000, 44301394943232879298360] |