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 | 5 |
| 2 | 55 |
| 3 | 481 |
| 4 | 10501 |
| 5 | 117181 |
| 6 | 3879331 |
| 7 | 52751105 |
| 8 | 2351234953 |
| 9 | 37766866501 |
| 10 | 2120129149711 |
| 11 | 39311679607201 |
| 12 | 2663716583547085 |
| 13 | 56019878838007085 |
| 14 | 4448878347069812251 |
| 15 | 104660471059169187841 |
| 16 | 9534251497305019644433 |