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 | 21 |
| 1 | 336 |
| 2 | 2646 |
| 3 | 14112 |
| 4 | 58212 |
| 5 | 199584 |
| 6 | 594594 |
| 7 | 1585584 |
| 8 | 3864861 |
| 9 | 8744736 |
| 10 | 18582564 |
| 11 | 37425024 |
| 12 | 71954064 |
| 13 | 132838272 |
| 14 | 236618172 |
| 15 | 408282336 |
| 16 | 684723501 |
| 17 | 1119300336 |
| 18 | 1787771370 |
| 19 | 2795913120 |
| 20 | 4289184900 |
| 21 | 6464858400 |
| 22 | 9587091150 |
| 23 | 14005489680 |
| 24 | 20177780805 |
| 25 | 28697288256 |