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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 257 |
| 3 | 4128 |
| 4 | 66305 |
| 5 | 1065008 |
| 6 | 17106433 |
| 7 | 274767936 |
| 8 | 4413393409 |
| 9 | 70889062480 |
| 10 | 1138638393089 |
| 11 | 18289103351904 |
| 12 | 293764292023553 |
| 13 | 4718517775728752 |
| 14 | 75790048703683585 |
| 15 | 1217359297034666112 |
| 16 | 19553538801258341377 |
| 17 | 314073980117168128144 |
| 18 | 5044737220675948391681 |
| 19 | 81029869510932342395040 |
[1,16,257,4128,66305,1065008,17106433,274767936, 4413393409,70889062480,1138638393089, 18289103351904,293764292023553,4718517775728752, 75790048703683585,1217359297034666112, 19553538801258341377,314073980117168128144, 5044737220675948391681,81029869510932342395040] |