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 | 0 |
| 2 | 16 |
| 3 | 88 |
| 4 | 288 |
| 5 | 1104 |
| 6 | 3264 |
| 7 | 12032 |
| 8 | 34144 |
| 9 | 115112 |
| 10 | 323888 |
| 11 | 1043360 |
| 12 | 2903280 |
| 13 | 9122592 |
| 14 | 24993552 |
| 15 | 77246888 |
| 16 | 209811360 |
| 17 | 637734248 |
| 18 | 1726546928 |
| 19 | 5170075216 |
| 20 | 13965402144 |
| 21 | 41331646184 |
| 22 | 111361083152 |
| 23 | 326576770784 |
| 24 | 877687158464 |
| 25 | 2554653282056 |
| 26 | 6850500549888 |
| 27 | 19812687702472 |
| 28 | 53030550412576 |