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 | 12 |
| 2 | 106 |
| 3 | 828 |
| 4 | 6051 |
| 5 | 42408 |
| 6 | 288788 |
| 7 | 1925736 |
| 8 | 12637733 |
| 9 | 81897876 |
| 10 | 525360702 |
| 11 | 3341936196 |
| 12 | 21109664455 |
| 13 | 132544828560 |
| 14 | 827948567080 |
| 15 | 5148653356944 |
| 16 | 31891223012553 |
| 17 | 196848686563164 |
| 18 | 1211273655997202 |
| 19 | 7432579805359884 |