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 | 5 |
| 3 | 57 |
| 4 | 15 |
| 5 | 489 |
| 6 | 12675 |
| 7 | 41 |
| 8 | 4125 |
| 9 | 321689 |
| 10 | 24318165 |
| 11 | 113 |
| 12 | 35117 |
| 13 | 8180343 |
| 14 | 1840058693 |
| 15 | 414295148741 |
| 16 | 313 |
| 17 | 299681 |
| 18 | 208144601 |
| 19 | 139304759213 |
| 20 | 93332304864173 |
| 21 | 62567386502084877 |
| 22 | 867 |
| 23 | 2557605 |
| 24 | 5296282323 |
| 25 | 10546705714473 |
| 26 | 21026744638200555 |
| 27 | 41945191530093646965 |
| 28 | 83677847847984287628595 |