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 | 28 |
| 2 | 672 |
| 3 | 20972 |
| 4 | 870473 |
| 5 | 41299256 |
| 6 | 1976588468 |
| 7 | 89730161098 |
| 8 | 3776527762052 |
| 9 | 146582077597322 |
| 10 | 5255148833158068 |
| 11 | 174697385422916429 |
| 12 | 5408652963998274118 |
| 13 | 156617481905320805788 |
| 14 | 4258375831859896074183 |
| 15 | 109105728055490259454053 |