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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 13 |
| 5 | 28 |
| 6 | 61 |
| 7 | 119 |
| 8 | 226 |
| 9 | 423 |
| 10 | 790 |
| 11 | 1472 |
| 12 | 2764 |
| 13 | 5224 |
| 14 | 9956 |
| 15 | 19112 |
| 16 | 36923 |
| 17 | 71703 |
| 18 | 139835 |
| 19 | 273625 |
| 20 | 536860 |
| 21 | 1055588 |
| 22 | 2079066 |
| 23 | 4100573 |
| 24 | 8096789 |
| 25 | 16002500 |
| 26 | 31652194 |
| 27 | 62648225 |
| 28 | 124068499 |
| 29 | 245826760 |