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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 29 |
| 5 | 82 |
| 6 | 255 |
| 7 | 773 |
| 8 | 2410 |
| 9 | 7499 |
| 10 | 23575 |
| 11 | 74298 |
| 12 | 235325 |
| 13 | 747407 |
| 14 | 2381126 |
| 15 | 7603433 |
| 16 | 24332595 |
| 17 | 78013192 |
| 18 | 250540055 |
| 19 | 805803691 |
| 20 | 2595158718 |
| 21 | 8368026845 |
| 22 | 27012184877 |
| 23 | 87283372610 |
| 24 | 282294378071 |
| 25 | 913775677281 |
| 26 | 2960160734818 |