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 | 2 |
| 2 | 16 |
| 3 | 84 |
| 4 | 870 |
| 5 | 13902 |
| 6 | 264568 |
| 7 | 12327618 |
| 8 | 1144562438 |
| 9 | 64916691796 |
| 10 | 20511370392174 |
| 11 | 15431327748576322 |
| 12 | 2046762983891357336 |
| 13 | 5203964479172695849850 |
| 14 | 32433326970178563780859912 |