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 | 1 |
| 2 | 16 |
| 3 | 177 |
| 4 | 5548 |
| 5 | 39615 |
| 6 | 2236440 |
| 7 | 40325915 |
| 8 | 1207505768 |
| 9 | 13229393814 |
| 10 | 1737076976040 |
| 11 | 22446050738265 |
| 12 | 4058838484620084 |
| 13 | 60476452041557409 |
| 14 | 961082989270516112 |
| 15 | 32455938583801467735 |
| 16 | 9864953815464307351792 |
| 17 | 186195769473110823077652 |
| 18 | 70295408103581008790661648 |
| 19 | 1466826914074651870368663750 |