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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 8 |
| 14 | 25 |
| 15 | 88 |
| 16 | 378 |
| 17 | 2026 |
| 18 | 13351 |
| 19 | 104595 |
| 20 | 930586 |
| 21 | 9124662 |
| 22 | 96699987 |
| 23 | 1095469608 |
| 24 | 13175272208 |
| 25 | 167460699184 |
| 26 | 2241578965849 |
| 27 | 31510542635443 |
| 28 | 464047929509794 |
| 29 | 7143991172244290 |
| 30 | 114749135506381940 |
| 31 | 1919658575933845129 |
| 32 | 33393712487076999918 |
| 33 | 603152722419661386031 |