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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 57 |
| 5 | 305 |
| 6 | 1798 |
| 7 | 11531 |
| 8 | 79707 |
| 9 | 589426 |
| 10 | 4634471 |
| 11 | 38547861 |
| 12 | 337734048 |
| 13 | 3105588629 |
| 14 | 29877483743 |
| 15 | 299906019892 |
| 16 | 3133423928557 |
| 17 | 34002824654365 |
| 18 | 382507638525838 |
| 19 | 4452923233600903 |
| 20 | 53561431659306039 |
| 21 | 664728428775177890 |
| 22 | 8500763141347126563 |
| 23 | 111886109022440334593 |
| 24 | 1513989730079050155936 |