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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 28 |
| 6 | 33 |
| 7 | 61 |
| 8 | 582 |
| 9 | 643 |
| 10 | 1225 |
| 11 | 16568 |
| 12 | 17793 |
| 13 | 34361 |
| 14 | 601930 |
| 15 | 636291 |
| 16 | 1238221 |
| 17 | 26638932 |
| 18 | 27877153 |
| 19 | 54516085 |
| 20 | 1390779278 |
| 21 | 1445295363 |
| 22 | 2836074641 |
| 23 | 83691459952 |
| 24 | 86527534593 |
| 25 | 170218994545 |
| 26 | 5703754354578 |
| 27 | 5873973349123 |