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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 27 |
| 5 | 77 |
| 6 | 220 |
| 7 | 632 |
| 8 | 1821 |
| 9 | 5257 |
| 10 | 15206 |
| 11 | 44068 |
| 12 | 127951 |
| 13 | 372173 |
| 14 | 1084382 |
| 15 | 3164498 |
| 16 | 9248241 |
| 17 | 27064057 |
| 18 | 79296978 |
| 19 | 232597316 |
| 20 | 682960523 |
| 21 | 2007206245 |
| 22 | 5904191878 |
| 23 | 17380855190 |
| 24 | 51203234981 |
| 25 | 150943862857 |
| 26 | 445250129556 |