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 | 3 |
| 2 | 7 |
| 3 | 15 |
| 4 | 27 |
| 5 | 703 |
| 6 | 1819 |
| 7 | 4255 |
| 8 | 4591 |
| 9 | 9663 |
| 10 | 26623 |
| 11 | 60975 |
| 12 | 77671 |
| 13 | 113383 |
| 14 | 159487 |
| 15 | 1212415 |
| 16 | 2684647 |
| 17 | 3041127 |
| 18 | 3873535 |
| 19 | 4637979 |
| 20 | 5656191 |
| 21 | 6416623 |
| 22 | 6631675 |
| 23 | 19638399 |
| 24 | 80049391 |
| 25 | 210964383 |
| 26 | 319804831 |
| 27 | 1410123943 |
| 28 | 70141259775 |
| 29 | 77566362559 |