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 | 5 |
| 2 | 60 |
| 3 | 615 |
| 4 | 6170 |
| 5 | 61725 |
| 6 | 617280 |
| 7 | 6172835 |
| 8 | 61728390 |
| 9 | 617283945 |
| 10 | 6172839500 |
| 11 | 61728395055 |
| 12 | 617283950610 |
| 13 | 6172839506165 |
| 14 | 61728395061720 |
| 15 | 617283950617275 |
| 16 | 6172839506172830 |
| 17 | 61728395061728385 |
| 18 | 617283950617283940 |
| 19 | 6172839506172839495 |
| 20 | 61728395061728395050 |
| 21 | 617283950617283950605 |