The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 73 |
| 4 | 1045 |
| 5 | 19081 |
| 6 | 424051 |
| 7 | 11109337 |
| 8 | 335262313 |
| 9 | 11453449105 |
| 10 | 436944953791 |
| 11 | 18412283563081 |
| 12 | 849345673881277 |
| 13 | 42570185481576793 |
| 14 | 2303643608370636715 |
| 15 | 133859418832759525081 |
| 16 | 8312945340897388101841 |
| 17 | 549460711493172343519777 |
| 18 | 38513032385247860120975863 |
[1,1,7,73,1045,19081,424051,11109337,335262313, 11453449105,436944953791,18412283563081, 849345673881277,42570185481576793, 2303643608370636715,133859418832759525081, 8312945340897388101841,549460711493172343519777, 38513032385247860120975863] |