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 | 11 |
| 4 | 33 |
| 5 | 98 |
| 6 | 293 |
| 7 | 877 |
| 8 | 2628 |
| 9 | 7879 |
| 10 | 23629 |
| 11 | 70874 |
| 12 | 212601 |
| 13 | 637769 |
| 14 | 1913252 |
| 15 | 5739667 |
| 16 | 17218857 |
| 17 | 51656338 |
| 18 | 154968637 |
| 19 | 464905301 |
| 20 | 1394714916 |
| 21 | 4184143151 |
| 22 | 12552426869 |
| 23 | 37657276426 |
| 24 | 112971822513 |
| 25 | 338915456593 |
| 26 | 1016746352068 |
| 27 | 3050239027547 |
| 28 | 9150717036273 |