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 | 17 |
| 2 | 107 |
| 3 | 545 |
| 4 | 3235 |
| 5 | 19487 |
| 6 | 120311 |
| 7 | 752895 |
| 8 | 4762851 |
| 9 | 30376427 |
| 10 | 194992877 |
| 11 | 1258241573 |
| 12 | 8153851075 |
| 13 | 53026892117 |
| 14 | 345868792705 |
| 15 | 2261537247275 |
| 16 | 14818530646995 |
| 17 | 97269300449331 |
| 18 | 639438066653237 |
| 19 | 4208955700527261 |