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 | 4 |
| 3 | 35 |
| 4 | 93 |
| 5 | 197 |
| 6 | 905 |
| 7 | 4617 |
| 8 | 17190 |
| 9 | 60751 |
| 10 | 249752 |
| 11 | 1059063 |
| 12 | 4222592 |
| 13 | 16594402 |
| 14 | 66999457 |
| 15 | 272610044 |
| 16 | 1096920548 |
| 17 | 4397739438 |
| 18 | 17715067000 |
| 19 | 71488573309 |
| 20 | 287925302744 |
| 21 | 1158665331861 |
| 22 | 4666508501343 |
| 23 | 18801789510992 |
| 24 | 75728618048706 |