The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 22 |
| 2 | 484 |
| 3 | 1690 |
| 4 | 4993 |
| 5 | 24512 |
| 6 | 90232 |
| 7 | 486443 |
| 8 | 2001968 |
| 9 | 10846870 |
| 10 | 47911153 |
| 11 | 256232284 |
| 12 | 1188682252 |
| 13 | 6276190547 |
| 14 | 30137070988 |
| 15 | 157660283714 |
| 16 | 775400765057 |
| 17 | 4032502502920 |
| 18 | 20159263106416 |
| 19 | 104466312892411 |
| 20 | 528009028013752 |
[22,484,1690,4993,24512,90232,486443,2001968, 10846870,47911153,256232284,1188682252,6276190547, 30137070988,157660283714,775400765057, 4032502502920,20159263106416,104466312892411, 528009028013752] |