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 | 7 |
| 3 | 37 |
| 4 | 533 |
| 5 | 1627 |
| 6 | 18107 |
| 7 | 237371 |
| 8 | 95549 |
| 9 | 1632341 |
| 10 | 155685007 |
| 11 | 156188887 |
| 12 | 3602044091 |
| 13 | 18051406831 |
| 14 | 7751493599 |
| 15 | 225175759291 |
| 16 | 13981692518567 |
| 17 | 14000078506967 |
| 18 | 98115155543129 |
| 19 | 3634060848592973 |
| 20 | 3637485804655193 |