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 | 4 |
| 2 | 11 |
| 3 | 31 |
| 4 | 87 |
| 5 | 246 |
| 6 | 700 |
| 7 | 2003 |
| 8 | 5758 |
| 9 | 16616 |
| 10 | 48102 |
| 11 | 139625 |
| 12 | 406214 |
| 13 | 1184138 |
| 14 | 3457771 |
| 15 | 10112245 |
| 16 | 29613029 |
| 17 | 86824136 |
| 18 | 254840534 |
| 19 | 748725393 |
| 20 | 2201731878 |
| 21 | 6479790418 |
| 22 | 19084605389 |
| 23 | 56247812793 |
| 24 | 165884498711 |
| 25 | 489512360356 |