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 | 100 |
| 4 | 1060 |
| 5 | 9316 |
| 6 | 77092 |
| 7 | 624484 |
| 8 | 5019172 |
| 9 | 40223332 |
| 10 | 321996580 |
| 11 | 2576602468 |
| 12 | 20614709284 |
| 13 | 164923342948 |
| 14 | 1319403749668 |
| 15 | 10555281015652 |
| 16 | 84442401180196 |
| 17 | 675539668606564 |
| 18 | 5404318726347556 |
| 19 | 43234553943265636 |
| 20 | 345876443943580708 |
| 21 | 2767011588741012580 |
| 22 | 22136092821505201444 |
| 23 | 177088742906772914020 |