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 | 2 |
| 1 | 105 |
| 2 | 617 |
| 3 | 3077 |
| 4 | 9757 |
| 5 | 71731 |
| 6 | 306407 |
| 7 | 2071853 |
| 8 | 10770894 |
| 9 | 185768753 |
| 10 | 1672941615 |
| 11 | 14465494561 |
| 12 | 338610760068 |
| 13 | 1260607468485 |
| 14 | 5168248479349 |
| 15 | 151720540392580 |
| 16 | 1384591426590643 |
| 17 | 30464122079618738 |
| 18 | 121074568909128689 |
| 19 | 574695040334652831 |