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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 75 |
| 6 | 278 |
| 7 | 1154 |
| 8 | 5265 |
| 9 | 25913 |
| 10 | 135212 |
| 11 | 736704 |
| 12 | 4139831 |
| 13 | 23767895 |
| 14 | 138468210 |
| 15 | 814675838 |
| 16 | 4824766301 |
| 17 | 28699128501 |
| 18 | 171207852152 |
| 19 | 1023332115836 |
| 20 | 6124430348355 |
| 21 | 36684624841811 |
| 22 | 219860794899518 |
| 23 | 1318179574171578 |