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) |
|---|---|
| 4 | 1 |
| 5 | 11 |
| 6 | 77 |
| 7 | 412 |
| 8 | 2009 |
| 9 | 8869 |
| 10 | 36988 |
| 11 | 146578 |
| 12 | 560498 |
| 13 | 2078927 |
| 14 | 7530385 |
| 15 | 26734692 |
| 16 | 93360884 |
| 17 | 321454484 |
| 18 | 1093599885 |
| 19 | 3681897625 |
| 20 | 12284317088 |
| 21 | 40660245162 |
| 22 | 133638662066 |
| 23 | 436488290069 |
| 24 | 1417680926923 |
| 25 | 4581355626106 |