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 | 58 |
| 3 | 820 |
| 4 | 10546 |
| 5 | 128284 |
| 6 | 1509418 |
| 7 | 17390020 |
| 8 | 197581666 |
| 9 | 2223729964 |
| 10 | 24863682778 |
| 11 | 276721736020 |
| 12 | 3069708899986 |
| 13 | 33972956330044 |
| 14 | 375351787072138 |
| 15 | 4142063797326820 |
| 16 | 45668254886861506 |
| 17 | 503195228685608524 |