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 | 3 |
| 3 | 437 |
| 4 | 2639 |
| 5 | 4124589 |
| 6 | 27067013 |
| 7 | 27067101 |
| 8 | 27067139 |
| 9 | 27067271 |
| 10 | 382465573551 |
| 11 | 18262325820327 |
| 12 | 18262325820329 |
| 13 | 18262325820333 |
| 14 | 885992692751831 |
| 15 | 6201265271239783 |
| 16 | 6201265271239997 |
| 17 | 6201265271240071 |
| 18 | 6201265271240403 |
| 19 | 306268030480171331 |