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 | 3 |
| 2 | 19 |
| 3 | 169 |
| 4 | 1753 |
| 5 | 19795 |
| 6 | 236035 |
| 7 | 2923857 |
| 8 | 37256881 |
| 9 | 485202307 |
| 10 | 6429346899 |
| 11 | 86405569657 |
| 12 | 1174917167881 |
| 13 | 16134949855251 |
| 14 | 223460304878467 |
| 15 | 3117521211476641 |
| 16 | 43771643214792033 |
| 17 | 618045740600046211 |
| 18 | 8770377489446217235 |
| 19 | 125013010654218317385 |
| 20 | 1789104455068153153849 |