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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 13 |
| 5 | 23 |
| 6 | 167 |
| 7 | 311 |
| 8 | 503 |
| 9 | 1696463 |
| 10 | 3616703 |
| 11 | 119351231 |
| 12 | 393749999 |
| 13 | 388856692223 |
| 14 | 35437499999999 |
| 15 | 728640635326636031 |
| 16 | 3885182313590882303 |
| 17 | 19837740893195045044223 |
| 18 | 5126863427472785697108393983 |
| 19 | 140901732869280543971697196500573487103 |