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 | 28 |
| 3 | 253 |
| 4 | 1492 |
| 5 | 5485 |
| 6 | 17092 |
| 7 | 41905 |
| 8 | 95140 |
| 9 | 191773 |
| 10 | 364420 |
| 11 | 638785 |
| 12 | 1085500 |
| 13 | 1745389 |
| 14 | 2743084 |
| 15 | 4136257 |
| 16 | 6101740 |
| 17 | 8747821 |
| 18 | 12377764 |
| 19 | 17066737 |
| 20 | 23287564 |
| 21 | 31174813 |
| 22 | 41276548 |
| 23 | 53767873 |
| 24 | 69544324 |
| 25 | 88722973 |
| 26 | 112450132 |
| 27 | 140859361 |
| 28 | 175324636 |