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 | 1 |
| 3 | 13 |
| 4 | 93 |
| 5 | 1245 |
| 6 | 18093 |
| 7 | 308605 |
| 8 | 5887453 |
| 9 | 124221373 |
| 10 | 2864305277 |
| 11 | 71589605885 |
| 12 | 1927010749181 |
| 13 | 55572839581437 |
| 14 | 1709604517055229 |
| 15 | 55893262628149245 |
| 16 | 1935654236127347709 |
| 17 | 70799043456576835581 |
| 18 | 2727771901780930132989 |
| 19 | 110438840436968476274685 |
| 20 | 4688223534904569925386237 |