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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 19 |
| 6 | 41 |
| 7 | 104 |
| 8 | 235 |
| 9 | 572 |
| 10 | 1331 |
| 11 | 3193 |
| 12 | 7485 |
| 13 | 17811 |
| 14 | 41867 |
| 15 | 99181 |
| 16 | 233157 |
| 17 | 550718 |
| 18 | 1293817 |
| 19 | 3049649 |
| 20 | 7158201 |
| 21 | 16845217 |
| 22 | 39504435 |
| 23 | 92842398 |