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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 18 |
| 9 | 184 |
| 10 | 1030 |
| 11 | 4180 |
| 12 | 13750 |
| 13 | 38896 |
| 14 | 98098 |
| 15 | 225972 |
| 16 | 483412 |
| 17 | 972772 |
| 18 | 1858020 |
| 19 | 3395076 |
| 20 | 5966700 |
| 21 | 10139220 |
| 22 | 16715912 |
| 23 | 26838572 |
| 24 | 42058890 |
| 25 | 64517116 |
| 26 | 97018822 |
| 27 | 143341936 |
| 28 | 208297894 |