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 | 0 |
| 2 | 4 |
| 3 | 76 |
| 4 | 516 |
| 5 | 2148 |
| 6 | 6768 |
| 7 | 17600 |
| 8 | 40120 |
| 9 | 82608 |
| 10 | 157252 |
| 11 | 280988 |
| 12 | 477012 |
| 13 | 775172 |
| 14 | 1214768 |
| 15 | 1844512 |
| 16 | 2725000 |
| 17 | 3930384 |
| 18 | 5550844 |
| 19 | 7692300 |
| 20 | 10482124 |
| 21 | 14066996 |
| 22 | 18619128 |
| 23 | 24337056 |
| 24 | 31449200 |
| 25 | 40212160 |
| 26 | 50921316 |
| 27 | 63907468 |
| 28 | 79542108 |