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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 31 |
| 6 | 80 |
| 7 | 210 |
| 8 | 555 |
| 9 | 1479 |
| 10 | 3959 |
| 11 | 10652 |
| 12 | 28760 |
| 13 | 77910 |
| 14 | 211624 |
| 15 | 576221 |
| 16 | 1572210 |
| 17 | 4297733 |
| 18 | 11767328 |
| 19 | 32266801 |
| 20 | 88594626 |
| 21 | 243544919 |
| 22 | 670228623 |
| 23 | 1846283937 |
| 24 | 5090605118 |
| 25 | 14047668068 |
| 26 | 38794922293 |
| 27 | 107215238057 |
| 28 | 296501478704 |