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 | 1 |
| 3 | 16 |
| 4 | 51 |
| 5 | 191 |
| 6 | 569 |
| 7 | 1619 |
| 8 | 4259 |
| 9 | 10694 |
| 10 | 25709 |
| 11 | 59743 |
| 12 | 134818 |
| 13 | 296798 |
| 14 | 639518 |
| 15 | 1352498 |
| 16 | 2813750 |
| 17 | 5769200 |
| 18 | 11676395 |
| 19 | 23358450 |
| 20 | 46239770 |
| 21 | 90667076 |
| 22 | 176244326 |
| 23 | 339887026 |
| 24 | 650715076 |
| 25 | 1237467151 |
| 26 | 2338753519 |
| 27 | 4394813644 |
| 28 | 8214444389 |