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 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 33 |
| 5 | 91 |
| 6 | 298 |
| 7 | 881 |
| 8 | 2825 |
| 9 | 8791 |
| 10 | 27947 |
| 11 | 87410 |
| 12 | 272991 |
| 13 | 837370 |
| 14 | 2532012 |
| 15 | 7496030 |
| 16 | 21735743 |
| 17 | 61570427 |
| 18 | 170399621 |
| 19 | 460413115 |
| 20 | 1214983434 |
| 21 | 3131870712 |
| 22 | 7890604652 |
| 23 | 19441462894 |
| 24 | 46878788710 |
| 25 | 110702854983 |
| 26 | 256217556777 |