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) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 79 |
| 3 | 397 |
| 4 | 2311 |
| 5 | 13683 |
| 6 | 82987 |
| 7 | 510131 |
| 8 | 3168583 |
| 9 | 19831375 |
| 10 | 124840519 |
| 11 | 789359815 |
| 12 | 5007964879 |
| 13 | 31854401891 |
| 14 | 203018085727 |
| 15 | 1295846704827 |
| 16 | 8280758646855 |
| 17 | 52962057017063 |
| 18 | 338958602652535 |
| 19 | 2170431924516647 |