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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 14 |
| 7 | 35 |
| 8 | 90 |
| 9 | 245 |
| 10 | 644 |
| 11 | 1716 |
| 12 | 4707 |
| 13 | 12727 |
| 14 | 34683 |
| 15 | 96174 |
| 16 | 264784 |
| 17 | 732785 |
| 18 | 2051338 |
| 19 | 5719684 |
| 20 | 16007081 |
| 21 | 45160093 |
| 22 | 127106181 |
| 23 | 358743903 |
| 24 | 1018566177 |
| 25 | 2887666445 |
| 26 | 8204375034 |