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 | 5 |
| 3 | 29 |
| 4 | 274 |
| 5 | 3129 |
| 6 | 47515 |
| 7 | 823549 |
| 8 | 16843268 |
| 9 | 387459861 |
| 10 | 10009769725 |
| 11 | 285311670621 |
| 12 | 8918311856102 |
| 13 | 302875106592265 |
| 14 | 11112685048729175 |
| 15 | 437893951473411261 |
| 16 | 18447025557276459016 |
| 17 | 827240261886336764193 |
| 18 | 39346558373052524325225 |
| 19 | 1978419655660313589123997 |