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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 72 |
| 6 | 280 |
| 7 | 1242 |
| 8 | 6331 |
| 9 | 36236 |
| 10 | 230726 |
| 11 | 1615584 |
| 12 | 12342422 |
| 13 | 102145644 |
| 14 | 910393530 |
| 15 | 8693609421 |
| 16 | 88552405435 |
| 17 | 958361506524 |
| 18 | 10982014291650 |
| 19 | 132835979792636 |
| 20 | 1691320230842116 |
| 21 | 22611285878526978 |
| 22 | 316685416851528722 |
| 23 | 4636988553066906265 |