The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 25 |
| 3 | 111 |
| 4 | 433 |
| 5 | 1751 |
| 6 | 7033 |
| 7 | 28047 |
| 8 | 112305 |
| 9 | 449495 |
| 10 | 1797241 |
| 11 | 7189903 |
| 12 | 28761777 |
| 13 | 115041239 |
| 14 | 460172409 |
| 15 | 1840706959 |
| 16 | 7362780849 |
| 17 | 29451183063 |
| 18 | 117804870777 |
| 19 | 471219107215 |
| 20 | 1884876906161 |
| 21 | 7539508732887 |
| 22 | 30158031924345 |
| 23 | 120632131515791 |
| 24 | 482528534929073 |
[1,7,25,111,433,1751,7033,28047,112305,449495, 1797241,7189903,28761777,115041239,460172409, 1840706959,7362780849,29451183063,117804870777, 471219107215,1884876906161,7539508732887, 30158031924345,120632131515791,482528534929073] |