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 | 4 |
| 3 | 9 |
| 4 | 26 |
| 5 | 55 |
| 6 | 154 |
| 7 | 323 |
| 8 | 900 |
| 9 | 1885 |
| 10 | 5248 |
| 11 | 10989 |
| 12 | 30590 |
| 13 | 64051 |
| 14 | 178294 |
| 15 | 373319 |
| 16 | 1039176 |
| 17 | 2175865 |
| 18 | 6056764 |
| 19 | 12681873 |
| 20 | 35301410 |
| 21 | 73915375 |
| 22 | 205751698 |
| 23 | 430810379 |
| 24 | 1199208780 |
| 25 | 2510946901 |
| 26 | 6989500984 |
| 27 | 14634871029 |
| 28 | 40737797126 |
| 29 | 85298279275 |
| 30 | 237437281774 |