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) |
|---|---|
| 5 | 1 |
| 6 | 12 |
| 7 | 80 |
| 8 | 393 |
| 9 | 1594 |
| 10 | 5676 |
| 11 | 18437 |
| 12 | 56070 |
| 13 | 162643 |
| 14 | 456169 |
| 15 | 1249622 |
| 16 | 3368279 |
| 17 | 8981185 |
| 18 | 23778766 |
| 19 | 62674883 |
| 20 | 164736197 |
| 21 | 432269179 |
| 22 | 1133152915 |
| 23 | 2968751841 |
| 24 | 7775322683 |
| 25 | 20360324313 |
| 26 | 53309942401 |
| 27 | 139575355815 |
| 28 | 365424013769 |