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) |
|---|---|
| 4 | 1 |
| 5 | 11 |
| 6 | 87 |
| 7 | 693 |
| 8 | 5934 |
| 9 | 55674 |
| 10 | 572650 |
| 11 | 6429470 |
| 12 | 78366855 |
| 13 | 1031378445 |
| 14 | 14583751161 |
| 15 | 220562730171 |
| 16 | 3553474061452 |
| 17 | 60765835154948 |
| 18 | 1099353888345924 |
| 19 | 20980355229808524 |
| 20 | 421242574828254525 |
| 21 | 8876636475162819615 |
| 22 | 195887449298481357835 |
| 23 | 4517865858233007694865 |
| 24 | 108699311713253202373146 |
| 25 | 2723633081926998772488606 |