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 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 342 |
| 5 | 4048 |
| 6 | 57437 |
| 7 | 950512 |
| 8 | 17975438 |
| 9 | 382424397 |
| 10 | 9039989107 |
| 11 | 235062317196 |
| 12 | 6667866337309 |
| 13 | 204905200542916 |
| 14 | 6781157167505291 |
| 15 | 240446179599065951 |
| 16 | 9094120016963808935 |
| 17 | 365453749501228063845 |