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 | 0 |
| 2 | 2 |
| 3 | 5 |
| 4 | 74 |
| 5 | 2856 |
| 6 | 100176 |
| 7 | 15243860 |
| 8 | 3267873712 |
| 9 | 1423142192108 |
| 10 | 1493258497764034 |
| 11 | 2656316754272813006 |
| 12 | 10809582885066864547012 |
| 13 | 85481211759186744525328998 |
| 14 | 1368540960166632565900365694716 |