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 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 23 |
| 6 | 72 |
| 7 | 201 |
| 8 | 597 |
| 9 | 1705 |
| 10 | 5141 |
| 11 | 15305 |
| 12 | 45558 |
| 13 | 136366 |
| 14 | 408269 |
| 15 | 1222895 |
| 16 | 3664732 |
| 17 | 10990002 |
| 18 | 32961810 |
| 19 | 98879571 |
| 20 | 296674303 |
| 21 | 890217834 |
| 22 | 2671430941 |
| 23 | 8017066909 |
| 24 | 24060553805 |
| 25 | 72211714389 |
| 26 | 216729874503 |
| 27 | 650484059608 |