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 | 181 |
| 3 | 9797 |
| 4 | 616501 |
| 5 | 45778505 |
| 6 | 3678753205 |
| 7 | 314352091205 |
| 8 | 28154344881205 |
| 9 | 2612340741982505 |
| 10 | 249415797821914681 |
| 11 | 24374175871569953225 |
| 12 | 2428502737999745059381 |
| 13 | 245952659136011117909897 |
| 14 | 25260608441078125508484181 |
| 15 | 2626023605592369669830217797 |