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 | 2 |
| 3 | 7 |
| 4 | 63 |
| 5 | 1234 |
| 6 | 55447 |
| 7 | 5598861 |
| 8 | 1280128950 |
| 9 | 660647962955 |
| 10 | 770548397261707 |
| 11 | 2030049051145980050 |
| 12 | 12083401651433651945979 |
| 13 | 162481813349792588536582997 |
| 14 | 4935961285224791538367780371090 |
| 15 | 338752110195939290445247645371206783 |