| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 23 |
| 3 | 105 |
| 4 | 479 |
| 5 | 2185 |
| 6 | 9967 |
| 7 | 45465 |
| 8 | 207391 |
| 9 | 946025 |
| 10 | 4315343 |
| 11 | 19684665 |
| 12 | 89792639 |
| 13 | 409593865 |
| 14 | 1868384047 |
| 15 | 8522732505 |
| 16 | 38876894431 |
| 17 | 177339007145 |
| 18 | 808941246863 |
| 19 | 3690028220025 |
| 20 | 16832258606399 |
| 21 | 76781236591945 |
| 22 | 350241665746927 |
| 23 | 1597645855550745 |
| 24 | 7287745946259871 |
[1,5,23,105,479,2185,9967,45465,207391,946025, 4315343,19684665,89792639,409593865,1868384047, 8522732505,38876894431,177339007145,808941246863, 3690028220025,16832258606399,76781236591945, 350241665746927,1597645855550745,7287745946259871] |