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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 185 |
| 3 | 1880 |
| 4 | 17841 |
| 5 | 162336 |
| 6 | 1435945 |
| 7 | 12448360 |
| 8 | 106312481 |
| 9 | 897579056 |
| 10 | 7510186905 |
| 11 | 62388376440 |
| 12 | 515255179921 |
| 13 | 4235078618176 |
| 14 | 34671889197065 |
| 15 | 282913935338120 |
| 16 | 2302083235036161 |
| 17 | 18688068146607696 |
| 18 | 151404361037090425 |
| 19 | 1224533599346325400 |
| 20 | 9889359772117817201 |
[1,16,185,1880,17841,162336,1435945,12448360, 106312481,897579056,7510186905,62388376440, 515255179921,4235078618176,34671889197065, 282913935338120,2302083235036161, 18688068146607696,151404361037090425, 1224533599346325400,9889359772117817201] |