The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 12 |
| 4 | 36 |
| 5 | 104 |
| 6 | 352 |
| 7 | 1172 |
| 8 | 4119 |
| 9 | 14572 |
| 10 | 52492 |
| 11 | 190652 |
| 12 | 699266 |
| 13 | 2581112 |
| 14 | 9587602 |
| 15 | 35791472 |
| 16 | 134219859 |
| 17 | 505290272 |
| 18 | 1908881998 |
| 19 | 7233629132 |
| 20 | 27487817244 |
| 21 | 104715393912 |
| 22 | 399822505942 |
| 23 | 1529755308212 |
| 24 | 5864062368274 |
| 25 | 22517998136936 |
[12,36,104,352,1172,4119,14572,52492,190652, 699266,2581112,9587602,35791472,134219859, 505290272,1908881998,7233629132,27487817244, 104715393912,399822505942,1529755308212, 5864062368274,22517998136936] |