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 | 10 |
| 3 | 30 |
| 4 | 76 |
| 5 | 196 |
| 6 | 470 |
| 7 | 1063 |
| 8 | 2356 |
| 9 | 5142 |
| 10 | 10785 |
| 11 | 22120 |
| 12 | 44594 |
| 13 | 88367 |
| 14 | 172794 |
| 15 | 332045 |
| 16 | 628230 |
| 17 | 1175169 |
| 18 | 2173393 |
| 19 | 3977199 |
| 20 | 7209289 |
| 21 | 12934491 |
| 22 | 22987311 |
| 23 | 40509706 |
| 24 | 70823871 |
| 25 | 122892290 |
| 26 | 211765621 |
| 27 | 362436448 |
| 28 | 616131473 |
| 29 | 1040782758 |