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 | 2 |
| 5 | 82 |
| 6 | 982 |
| 7 | 7002 |
| 8 | 34568 |
| 9 | 131248 |
| 10 | 412596 |
| 11 | 1123832 |
| 12 | 2739386 |
| 13 | 6106214 |
| 14 | 12654614 |
| 15 | 24675650 |
| 16 | 45704724 |
| 17 | 80999104 |
| 18 | 138170148 |
| 19 | 227938788 |
| 20 | 365106738 |
| 21 | 569681574 |
| 22 | 868289594 |
| 23 | 1295775946 |
| 24 | 1897176508 |
| 25 | 2729909796 |