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 | 3 |
| 2 | 14 |
| 3 | 52 |
| 4 | 184 |
| 5 | 656 |
| 6 | 34688 |
| 7 | 2118656 |
| 8 | 134438912 |
| 9 | 537346048 |
| 10 | 9007202811510784 |
| 11 | 2417851639318318791262208 |
| 12 | 633825300114170432793740312576 |
| 13 | 2535301200456572518883997515776 |