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 | 1 |
| 1 | 27 |
| 2 | 567 |
| 3 | 10935 |
| 4 | 203391 |
| 5 | 3720087 |
| 6 | 67493007 |
| 7 | 1219657095 |
| 8 | 21996874431 |
| 9 | 396331160247 |
| 10 | 7137447668847 |
| 11 | 128505439098855 |
| 12 | 2313380333315871 |
| 13 | 41643387865514007 |
| 14 | 749603858371707087 |
| 15 | 13493075341822822215 |