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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 109 |
| 4 | 1640 |
| 5 | 27151 |
| 6 | 478232 |
| 7 | 8782075 |
| 8 | 166237160 |
| 9 | 3220837534 |
| 10 | 63562714008 |
| 11 | 1273237637706 |
| 12 | 25820645555000 |
| 13 | 529080420540114 |
| 14 | 10937268134114568 |
| 15 | 227824992158991334 |
| 16 | 4777204094770874856 |
| 17 | 100757627271124231383 |
| 18 | 2136117417345649876112 |
| 19 | 45496022230420668679932 |
[1,8,109,1640,27151,478232,8782075,166237160, 3220837534,63562714008,1273237637706, 25820645555000,529080420540114,10937268134114568, 227824992158991334,4777204094770874856, 100757627271124231383,2136117417345649876112, 45496022230420668679932] |