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 | 10 |
| 3 | 26 |
| 4 | 68 |
| 5 | 178 |
| 6 | 466 |
| 7 | 1220 |
| 8 | 3194 |
| 9 | 8362 |
| 10 | 21892 |
| 11 | 57314 |
| 12 | 150050 |
| 13 | 392836 |
| 14 | 1028458 |
| 15 | 2692538 |
| 16 | 7049156 |
| 17 | 18454930 |
| 18 | 48315634 |
| 19 | 126491972 |
| 20 | 331160282 |
| 21 | 866988874 |
| 22 | 2269806340 |
| 23 | 5942430146 |
| 24 | 15557484098 |
| 25 | 40730022148 |
| 26 | 106632582346 |
| 27 | 279167724890 |
| 28 | 730870592324 |