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 | -3 |
| 2 | 2 |
| 3 | 123 |
| 4 | 684 |
| 5 | 2345 |
| 6 | 6222 |
| 7 | 14007 |
| 8 | 28088 |
| 9 | 51669 |
| 10 | 88890 |
| 11 | 144947 |
| 12 | 226212 |
| 13 | 340353 |
| 14 | 496454 |
| 15 | 705135 |
| 16 | 978672 |
| 17 | 1331117 |
| 18 | 1778418 |
| 19 | 2338539 |
| 20 | 3031580 |
| 21 | 3879897 |
| 22 | 4908222 |
| 23 | 6143783 |
| 24 | 7616424 |
| 25 | 9358725 |
| 26 | 11406122 |
| 27 | 13797027 |
| 28 | 16572948 |
| 29 | 19778609 |
| 30 | 23462070 |