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) |
|---|---|
| 3 | 3 |
| 4 | 6 |
| 5 | 44 |
| 6 | 180 |
| 7 | 1407 |
| 8 | 10384 |
| 9 | 92896 |
| 10 | 911512 |
| 11 | 9913152 |
| 12 | 117788056 |
| 13 | 1519021046 |
| 14 | 21123287848 |
| 15 | 315034832581 |
| 16 | 5015656588706 |
| 17 | 84899016219708 |
| 18 | 1522394744470356 |
| 19 | 28828385427350245 |
| 20 | 574839634258405032 |
| 21 | 12039133083940334978 |
| 22 | 264216869431056251276 |
| 23 | 6063573884814663905952 |