The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 9 |
| 4 | 33 |
| 5 | 81 |
| 6 | 225 |
| 7 | 729 |
| 8 | 2241 |
| 9 | 6561 |
| 10 | 19521 |
| 11 | 59049 |
| 12 | 177633 |
| 13 | 531441 |
| 14 | 1592865 |
| 15 | 4782969 |
| 16 | 14353281 |
| 17 | 43046721 |
| 18 | 129127041 |
| 19 | 387420489 |
| 20 | 1162300833 |
| 21 | 3486784401 |
| 22 | 10460235105 |
| 23 | 31381059609 |
| 24 | 94143533121 |
| 25 | 282429536481 |
| 26 | 847287546561 |
| 27 | 2541865828329 |
| 28 | 7625600673633 |
[1,1,9,33,81,225,729,2241,6561,19521,59049,177633, 531441,1592865,4782969,14353281,43046721, 129127041,387420489,1162300833,3486784401, 10460235105,31381059609,94143533121,282429536481, 847287546561,2541865828329,7625600673633] |