The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 45 |
| 3 | 717 |
| 4 | 9787 |
| 5 | 148414 |
| 6 | 2282036 |
| 7 | 34688229 |
| 8 | 530613082 |
| 9 | 8119995275 |
| 10 | 124183342755 |
| 11 | 1899899589557 |
| 12 | 29066650643742 |
| 13 | 444678773140018 |
| 14 | 6803102237763707 |
| 15 | 104079849391557116 |
| 16 | 1592303310404361651 |
| 17 | 24360457647669398381 |
| 18 | 372687643806340329749 |
| 19 | 5701702230014416236396 |
[1,4,45,717,9787,148414,2282036,34688229, 530613082,8119995275,124183342755,1899899589557, 29066650643742,444678773140018,6803102237763707, 104079849391557116,1592303310404361651, 24360457647669398381,372687643806340329749, 5701702230014416236396] |