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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 243 |
| 3 | 6250 |
| 4 | 50421 |
| 5 | 805255 |
| 6 | 2227758 |
| 7 | 11358856 |
| 8 | 22284891 |
| 9 | 70799773 |
| 10 | 287156086 |
| 11 | 429437265 |
| 12 | 1248191226 |
| 13 | 2317124020 |
| 14 | 3087177303 |
| 15 | 5274935161 |
| 16 | 10873082818 |
| 17 | 20732804671 |
| 18 | 25337889030 |
| 19 | 44554128531 |
| 20 | 63148027285 |
| 21 | 74630577348 |
[16,243,6250,50421,805255,2227758,11358856, 22284891,70799773,287156086,429437265,1248191226, 2317124020,3087177303,5274935161,10873082818, 20732804671,25337889030,44554128531,63148027285, 74630577348] |