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 | 68 |
| 7 | 313 |
| 8 | 1201 |
| 9 | 4082 |
| 10 | 12761 |
| 11 | 37633 |
| 12 | 106573 |
| 13 | 293526 |
| 14 | 793453 |
| 15 | 2118657 |
| 16 | 5612906 |
| 17 | 14797581 |
| 18 | 38896117 |
| 19 | 102061314 |
| 20 | 267532982 |
| 21 | 700883736 |
| 22 | 1835598926 |
| 23 | 4806570842 |
| 24 | 12585001630 |
| 25 | 32949618088 |
| 26 | 86265413414 |
| 27 | 225848657954 |