The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 71 |
| 5 | 203 |
| 6 | 579 |
| 7 | 1659 |
| 8 | 4761 |
| 9 | 13683 |
| 10 | 39399 |
| 11 | 113617 |
| 12 | 328141 |
| 13 | 949123 |
| 14 | 2749119 |
| 15 | 7973617 |
| 16 | 23157121 |
| 17 | 67337563 |
| 18 | 196043189 |
| 19 | 571406485 |
| 20 | 1667307271 |
| 21 | 4870143753 |
| 22 | 14239758879 |
| 23 | 41675219715 |
| 24 | 122080952361 |
| 25 | 357926363463 |
| 26 | 1050260357829 |
| 27 | 3084183651309 |
| 28 | 9063723857271 |
| 29 | 26655094384653 |
| 30 | 78441446368179 |
[1,3,9,25,71,203,579,1659,4761,13683,39399,113617, 328141,949123,2749119,7973617,23157121,67337563, 196043189,571406485,1667307271,4870143753, 14239758879,41675219715,122080952361,357926363463, 1050260357829,3084183651309,9063723857271, 26655094384653,78441446368179] |