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) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 7 |
| 6 | 16 |
| 7 | 43 |
| 8 | 124 |
| 9 | 367 |
| 10 | 1096 |
| 11 | 3283 |
| 12 | 9844 |
| 13 | 29527 |
| 14 | 88576 |
| 15 | 265723 |
| 16 | 797164 |
| 17 | 2391487 |
| 18 | 7174456 |
| 19 | 21523363 |
| 20 | 64570084 |
| 21 | 193710247 |
| 22 | 581130736 |
| 23 | 1743392203 |
| 24 | 5230176604 |
| 25 | 15690529807 |
| 26 | 47071589416 |
| 27 | 141214768243 |
| 28 | 423644304724 |
| 29 | 1270932914167 |
| 30 | 3812798742496 |