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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 16 |
| 5 | 110 |
| 6 | 435 |
| 7 | 1295 |
| 8 | 3220 |
| 9 | 7056 |
| 10 | 14070 |
| 11 | 26070 |
| 12 | 45540 |
| 13 | 75790 |
| 14 | 121121 |
| 15 | 187005 |
| 16 | 280280 |
| 17 | 409360 |
| 18 | 584460 |
| 19 | 817836 |
| 20 | 1124040 |
| 21 | 1520190 |
| 22 | 2026255 |
| 23 | 2665355 |
| 24 | 3464076 |
| 25 | 4452800 |
| 26 | 5666050 |
| 27 | 7142850 |
| 28 | 8927100 |
| 29 | 11067966 |
| 30 | 13620285 |