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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 61 |
| 5 | 751 |
| 6 | 11821 |
| 7 | 226927 |
| 8 | 5142061 |
| 9 | 134341711 |
| 10 | 3975839341 |
| 11 | 131463171247 |
| 12 | 4803293266861 |
| 13 | 192178106208271 |
| 14 | 8356430510670061 |
| 15 | 392386967808249967 |
| 16 | 19788154572706556461 |
| 17 | 1066668756919315412431 |
| 18 | 61204224384073232815981 |