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 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 89 |
| 11 | 135 |
| 12 | 2537 |
| 13 | 60409 |
| 14 | 4901732 |
| 15 | 17735872 |
| 16 | 45279768 |
| 17 | 393470463 |
| 18 | 3623008669 |
| 19 | 3893095238 |
| 20 | 229386834955666 |
| 21 | 1892713761283624 |
| 22 | 1501212693940707502 |
| 23 | 1517944702855898904 |
| 24 | 12303679765763687463 |
| 25 | 122947811178635339597 |
| 26 | 1095354314191826124704 |
| 27 | 1106509957063490820877 |