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 | 172 |
| 2 | 484 |
| 3 | 1376 |
| 4 | 3904 |
| 5 | 11020 |
| 6 | 31104 |
| 7 | 87888 |
| 8 | 248568 |
| 9 | 702724 |
| 10 | 1985932 |
| 11 | 5612156 |
| 12 | 15862556 |
| 13 | 44837136 |
| 14 | 126731180 |
| 15 | 358188232 |
| 16 | 1012377900 |
| 17 | 2861418780 |
| 18 | 8087637712 |
| 19 | 22859103016 |
| 20 | 64609341900 |
| 21 | 182613147216 |
| 22 | 516142417472 |
| 23 | 1458837964296 |