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 | 1 |
| 2 | 7 |
| 3 | 28 |
| 4 | 88 |
| 5 | 245 |
| 6 | 639 |
| 7 | 1608 |
| 8 | 3968 |
| 9 | 9689 |
| 10 | 23527 |
| 11 | 56964 |
| 12 | 137720 |
| 13 | 332717 |
| 14 | 803519 |
| 15 | 1940176 |
| 16 | 4684352 |
| 17 | 11309425 |
| 18 | 27303815 |
| 19 | 65917740 |
| 20 | 159140056 |
| 21 | 384198693 |
| 22 | 927538367 |
| 23 | 2239276440 |
| 24 | 5406092352 |
| 25 | 13051462345 |
| 26 | 31509018343 |
| 27 | 76069500436 |