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 | 8 |
| 3 | 28 |
| 4 | 98 |
| 5 | 354 |
| 6 | 1300 |
| 7 | 4834 |
| 8 | 18142 |
| 9 | 68578 |
| 10 | 260720 |
| 11 | 995856 |
| 12 | 3818644 |
| 13 | 14690940 |
| 14 | 56677652 |
| 15 | 219195454 |
| 16 | 849523318 |
| 17 | 3298629106 |
| 18 | 12829651312 |
| 19 | 49973834584 |
| 20 | 194917940188 |
| 21 | 761178474076 |
| 22 | 2975764881352 |
| 23 | 11645184195364 |