The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3550 |
| 2 | 10064 |
| 3 | 64560 |
| 4 | 266074 |
| 5 | 1547188 |
| 6 | 8858020 |
| 7 | 51974842 |
| 8 | 316785048 |
| 9 | 1889816848 |
| 10 | 11520937494 |
| 11 | 69228976028 |
| 12 | 420338522082 |
| 13 | 2533933878238 |
| 14 | 15348106027014 |
| 15 | 92666482760148 |
| 16 | 560658619860350 |
| 17 | 3387466997245654 |
| 18 | 20485364481865874 |
[3550,10064,64560,266074,1547188,8858020,51974842, 316785048,1889816848,11520937494,69228976028, 420338522082,2533933878238,15348106027014, 92666482760148,560658619860350,3387466997245654, 20485364481865874] |