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 | 198 |
| 3 | 20548 |
| 4 | 4088918 |
| 5 | 1341552690 |
| 6 | 661685880676 |
| 7 | 460785157967228 |
| 8 | 432879460822014552 |
| 9 | 529918744425680488240 |
| 10 | 822575286838815581568992 |
| 11 | 1583737023708711008926884072 |
| 12 | 3713773722396456674797120593784 |
| 13 | 10445266376618187161982580673417192 |