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 | 1 |
| 3 | 5 |
| 4 | 52 |
| 5 | 1547 |
| 6 | 116501 |
| 7 | 23266914 |
| 8 | 12105638490 |
| 9 | 16520674898562 |
| 10 | 58983635652443448 |
| 11 | 551479789789947609461 |
| 12 | 13497628802000408584637131 |
| 13 | 864924115332005227077169874150 |
| 14 | 145099921975789867545171624212383670 |