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 | 9 |
| 2 | 25 |
| 3 | 39 |
| 4 | 95 |
| 5 | 267 |
| 6 | 2369 |
| 7 | 6559 |
| 8 | 8817 |
| 9 | 13705 |
| 10 | 15261 |
| 11 | 21583 |
| 12 | 35981 |
| 13 | 66921 |
| 14 | 113009 |
| 15 | 340891 |
| 16 | 783757 |
| 17 | 872219 |
| 18 | 3058853 |
| 19 | 3586843 |
| 20 | 5835191 |
| 21 | 12345473 |
| 22 | 108994623 |
| 23 | 248706917 |
| 24 | 268749691 |
| 25 | 679956119 |
| 26 | 709239621 |
| 27 | 3648864859 |
| 28 | 3790337723 |
| 29 | 4171420481 |
| 30 | 33955869693 |
| 31 | 34279038379 |