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 | 5 |
| 3 | 12 |
| 4 | 30 |
| 5 | 76 |
| 6 | 197 |
| 7 | 522 |
| 8 | 1418 |
| 9 | 3956 |
| 10 | 11354 |
| 11 | 33554 |
| 12 | 102104 |
| 13 | 319608 |
| 14 | 1027237 |
| 15 | 3381714 |
| 16 | 11371366 |
| 17 | 38946892 |
| 18 | 135505958 |
| 19 | 477781296 |
| 20 | 1703671604 |
| 21 | 6132978608 |
| 22 | 22256615602 |
| 23 | 81327116484 |
| 24 | 298938112816 |
| 25 | 1104473254912 |
| 26 | 4098996843500 |
| 27 | 15272792557230 |
| 28 | 57106723430892 |
| 29 | 214202598271360 |
| 30 | 805743355591301 |