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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 41 |
| 5 | 120 |
| 6 | 337 |
| 7 | 855 |
| 8 | 1671 |
| 9 | 434 |
| 10 | -20393 |
| 11 | -158032 |
| 12 | -885329 |
| 13 | -4322580 |
| 14 | -19407365 |
| 15 | -81796098 |
| 16 | -325964629 |
| 17 | -1226861808 |
| 18 | -4319079961 |
| 19 | -13880383674 |
| 20 | -38282558205 |
| 21 | -72411121618 |
| 22 | 65816173987 |
| 23 | 1746824677851 |
| 24 | 12859713835981 |
| 25 | 73356840199948 |
| 26 | 369390356474509 |