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 | 6 |
| 2 | 503 |
| 3 | 10784 |
| 4 | 150085 |
| 5 | 1673658 |
| 6 | 16205001 |
| 7 | 141166787 |
| 8 | 1126917480 |
| 9 | 8340736743 |
| 10 | 57745890265 |
| 11 | 376707516550 |
| 12 | 2329550843590 |
| 13 | 13722943412752 |
| 14 | 77304542920321 |
| 15 | 417679484040714 |
| 16 | 2169521229525151 |
| 17 | 10853156575543255 |
| 18 | 52367994237483811 |