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 | 7 |
| 3 | 22 |
| 4 | 71 |
| 5 | 226 |
| 6 | 717 |
| 7 | 2262 |
| 8 | 7107 |
| 9 | 22246 |
| 10 | 69413 |
| 11 | 215986 |
| 12 | 670441 |
| 13 | 2076686 |
| 14 | 6420403 |
| 15 | 19816362 |
| 16 | 61070499 |
| 17 | 187953174 |
| 18 | 577742469 |
| 19 | 1773918642 |
| 20 | 5441141589 |
| 21 | 16674016758 |
| 22 | 51052484343 |
| 23 | 156188410098 |
| 24 | 477487110429 |
| 25 | 1458741494826 |