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 | 4 |
| 3 | 35 |
| 4 | 536 |
| 5 | 16775 |
| 6 | 1060976 |
| 7 | 135007759 |
| 8 | 34460631520 |
| 9 | 17617985239071 |
| 10 | 18027600169142208 |
| 11 | 36907002795598798911 |
| 12 | 151143401509104346210176 |
| 13 | 1238053384151947477501575295 |
| 14 | 20283338091738780737237428502272 |
| 15 | 664629209970464486086782992577855743 |