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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 28 |
| 6 | 84 |
| 7 | 272 |
| 8 | 1679 |
| 9 | 5564 |
| 10 | 19613 |
| 11 | 70504 |
| 12 | 311534 |
| 13 | 1172750 |
| 14 | 4405073 |
| 15 | 16581264 |
| 16 | 67108040 |
| 17 | 260573610 |
| 18 | 1004778126 |
| 19 | 3867996120 |
| 20 | 15289911196 |
| 21 | 59854486782 |
| 22 | 233437968413 |
| 23 | 909025875014 |
| 24 | 3575067252387 |
| 25 | 14038457059264 |