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| n | a(n) |
|---|---|
| 0 | 12 |
| 1 | 37 |
| 2 | 900 |
| 3 | 2737 |
| 4 | 66588 |
| 5 | 202501 |
| 6 | 4926612 |
| 7 | 14982337 |
| 8 | 364502700 |
| 9 | 1108490437 |
| 10 | 26968273188 |
| 11 | 82013310001 |
| 12 | 1995287713212 |
| 13 | 6067876449637 |
| 14 | 147624322504500 |
| 15 | 448940843963137 |
| 16 | 10922204577619788 |
| 17 | 33215554576822501 |
| 18 | 808095514421359812 |
| 19 | 2457502097840901937 |
[12,37,900,2737,66588,202501,4926612,14982337, 364502700,1108490437,26968273188,82013310001, 1995287713212,6067876449637,147624322504500, 448940843963137,10922204577619788, 33215554576822501,808095514421359812, 2457502097840901937] |