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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 205 |
| 3 | 2500 |
| 4 | 30121 |
| 5 | 361816 |
| 6 | 4342885 |
| 7 | 52117900 |
| 8 | 625424641 |
| 9 | 7505125216 |
| 10 | 90061591165 |
| 11 | 1080739359700 |
| 12 | 12968873113561 |
| 13 | 155626479754216 |
| 14 | 1867517764225045 |
| 15 | 22410213192223900 |
| 16 | 268922558371256881 |
| 17 | 3227070700648792816 |
| 18 | 38724848408366644525 |
| 19 | 464698180902143126500 |
[1,16,205,2500,30121,361816,4342885,52117900, 625424641,7505125216,90061591165,1080739359700, 12968873113561,155626479754216,1867517764225045, 22410213192223900,268922558371256881, 3227070700648792816,38724848408366644525, 464698180902143126500] |