The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 48 |
| 1 | 345 |
| 2 | 2558 |
| 3 | 19096 |
| 4 | 142537 |
| 5 | 1063902 |
| 6 | 7941080 |
| 7 | 59273033 |
| 8 | 442419934 |
| 9 | 3302267352 |
| 10 | 24648459081 |
| 11 | 183978603230 |
| 12 | 1373234989528 |
| 13 | 10249965503305 |
| 14 | 76506784068318 |
| 15 | 571054410533336 |
| 16 | 4262408147993417 |
| 17 | 31815047541813982 |
| 18 | 237470747742538200 |
[48,345,2558,19096,142537,1063902,7941080, 59273033,442419934,3302267352,24648459081, 183978603230,1373234989528,10249965503305, 76506784068318,571054410533336,4262408147993417, 31815047541813982,237470747742538200] |