The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 43 |
| 3 | 249 |
| 4 | 1395 |
| 5 | 7653 |
| 6 | 41381 |
| 7 | 221399 |
| 8 | 1175027 |
| 9 | 6196725 |
| 10 | 32512401 |
| 11 | 169863147 |
| 12 | 884318973 |
| 13 | 4589954619 |
| 14 | 23761814955 |
| 15 | 122735222505 |
| 16 | 632698778835 |
| 17 | 3255832730565 |
| 18 | 16728131746145 |
| 19 | 85826852897675 |
| 20 | 439793834236745 |
| 21 | 2251006269442815 |
| 22 | 11509340056410735 |
| 23 | 58790764269668805 |
[1,7,43,249,1395,7653,41381,221399,1175027, 6196725,32512401,169863147,884318973,4589954619, 23761814955,122735222505,632698778835, 3255832730565,16728131746145,85826852897675, 439793834236745,2251006269442815, 11509340056410735,58790764269668805] |