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 | 2 |
| 2 | 8 |
| 3 | 27 |
| 4 | 99 |
| 5 | 363 |
| 6 | 1353 |
| 7 | 5082 |
| 8 | 19228 |
| 9 | 73150 |
| 10 | 279566 |
| 11 | 1072512 |
| 12 | 4127788 |
| 13 | 15930512 |
| 14 | 61628248 |
| 15 | 238911947 |
| 16 | 927891163 |
| 17 | 3609676487 |
| 18 | 14062955413 |
| 19 | 54860308997 |
| 20 | 214268628223 |
| 21 | 837780853637 |
| 22 | 3278934510163 |
| 23 | 12844867331387 |