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 | 3 |
| 2 | 10 |
| 3 | 41 |
| 4 | 116 |
| 5 | 427 |
| 6 | 1240 |
| 7 | 4181 |
| 8 | 12472 |
| 9 | 40091 |
| 10 | 121364 |
| 11 | 380701 |
| 12 | 1160186 |
| 13 | 3593969 |
| 14 | 10979532 |
| 15 | 33785469 |
| 16 | 103258800 |
| 17 | 316532947 |
| 18 | 966976444 |
| 19 | 2957131673 |
| 20 | 9026437602 |
| 21 | 27558146133 |
| 22 | 84043120308 |
| 23 | 256263107177 |
| 24 | 780817641926 |