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 | 5 |
| 2 | 221 |
| 3 | 4265 |
| 4 | 47065 |
| 5 | 249197 |
| 6 | 256429 |
| 7 | 82680629 |
| 8 | 4143028753 |
| 9 | 2698130885 |
| 10 | 18995900417 |
| 11 | 195163601089 |
| 12 | 581539439365 |
| 13 | 1924737382669 |
| 14 | 6155051150201285 |
| 15 | 25057502411145377 |
| 16 | 378391033557627665 |
| 17 | 1057252484775138401 |
| 18 | 24775866907947863945 |