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 | 2 |
| 2 | 2 |
| 3 | 18 |
| 4 | 71 |
| 5 | 83 |
| 6 | 747 |
| 7 | 1679 |
| 8 | 7538 |
| 9 | 22394 |
| 10 | 65186 |
| 11 | 177578 |
| 12 | 370898 |
| 13 | 1497119 |
| 14 | 2428283 |
| 15 | 5285858 |
| 16 | 47572722 |
| 17 | 129918074 |
| 18 | 274553378 |
| 19 | 1128916463 |
| 20 | 2107864523 |
| 21 | 6892205234 |
| 22 | 25794120683 |
| 23 | 14732727599 |
| 24 | 132594548391 |
| 25 | 214986322034 |
| 26 | 1934876898306 |
| 27 | 8608610563379 |
| 28 | 24645805942151 |
| 29 | 63317186094563 |
| 30 | 94369472696663 |