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 | 10 |
| 2 | 86 |
| 3 | 682 |
| 4 | 5462 |
| 5 | 43690 |
| 6 | 349526 |
| 7 | 2796202 |
| 8 | 22369622 |
| 9 | 178956970 |
| 10 | 1431655766 |
| 11 | 11453246122 |
| 12 | 91625968982 |
| 13 | 733007751850 |
| 14 | 5864062014806 |
| 15 | 46912496118442 |
| 16 | 375299968947542 |
| 17 | 3002399751580330 |
| 18 | 24019198012642646 |
| 19 | 192153584101141162 |