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 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 92 |
| 4 | 430 |
| 5 | 1505 |
| 6 | 4291 |
| 7 | 10528 |
| 8 | 23052 |
| 9 | 46185 |
| 10 | 86185 |
| 11 | 151756 |
| 12 | 254618 |
| 13 | 410137 |
| 14 | 638015 |
| 15 | 963040 |
| 16 | 1415896 |
| 17 | 2034033 |
| 18 | 2862597 |
| 19 | 3955420 |
| 20 | 5376070 |
| 21 | 7198961 |
| 22 | 9510523 |
| 23 | 12410432 |
| 24 | 16012900 |
| 25 | 20448025 |
| 26 | 25863201 |