This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 43 |
| 3 | 847 |
| 4 | 23881 |
| 5 | 870721 |
| 6 | 38894653 |
| 7 | 2055873037 |
| 8 | 125480383153 |
| 9 | 8684069883409 |
| 10 | 671922832985941 |
| 11 | 57475677232902589 |
| 12 | 5385592533714824521 |
| 13 | 548596467532888667257 |
| 14 | 60358911366712739334541 |
| 15 | 7133453715771227363127301 |
| 16 | 901261693601873814393568993 |