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 | 4 |
| 2 | 10 |
| 3 | 28 |
| 4 | 74 |
| 5 | 202 |
| 6 | 534 |
| 7 | 1442 |
| 8 | 3822 |
| 9 | 10258 |
| 10 | 27202 |
| 11 | 72718 |
| 12 | 192840 |
| 13 | 514228 |
| 14 | 1363342 |
| 15 | 3629316 |
| 16 | 9619264 |
| 17 | 25575326 |
| 18 | 67765590 |
| 19 | 180001304 |
| 20 | 476807826 |
| 21 | 1265567600 |
| 22 | 3351529410 |
| 23 | 8890447682 |
| 24 | 23538665948 |
| 25 | 62409037914 |
| 26 | 165202281046 |