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 | 3 |
| 2 | 9 |
| 3 | 28 |
| 4 | 72 |
| 5 | 183 |
| 6 | 443 |
| 7 | 1026 |
| 8 | 2313 |
| 9 | 5072 |
| 10 | 10860 |
| 11 | 22767 |
| 12 | 46862 |
| 13 | 94806 |
| 14 | 188886 |
| 15 | 371068 |
| 16 | 719493 |
| 17 | 1378449 |
| 18 | 2611540 |
| 19 | 4896291 |
| 20 | 9090651 |
| 21 | 16723930 |
| 22 | 30501744 |
| 23 | 55177932 |
| 24 | 99048719 |
| 25 | 176500572 |
| 26 | 312330813 |
| 27 | 549033172 |