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 | 20 |
| 4 | 50 |
| 5 | 117 |
| 6 | 283 |
| 7 | 639 |
| 8 | 1512 |
| 9 | 3338 |
| 10 | 7774 |
| 11 | 16898 |
| 12 | 38884 |
| 13 | 83566 |
| 14 | 190488 |
| 15 | 405848 |
| 16 | 918120 |
| 17 | 1942813 |
| 18 | 4367665 |
| 19 | 9191499 |
| 20 | 20555546 |
| 21 | 43061789 |
| 22 | 95874233 |
| 23 | 200083005 |
| 24 | 443770612 |
| 25 | 923124007 |
| 26 | 2040635445 |
| 27 | 4233080627 |
| 28 | 9330343290 |