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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 26 |
| 4 | 96 |
| 5 | 321 |
| 6 | 1002 |
| 7 | 2972 |
| 8 | 8472 |
| 9 | 23392 |
| 10 | 62912 |
| 11 | 165504 |
| 12 | 427264 |
| 13 | 1085184 |
| 14 | 2717184 |
| 15 | 6718464 |
| 16 | 16427008 |
| 17 | 39763968 |
| 18 | 95387648 |
| 19 | 226951168 |
| 20 | 535953408 |
| 21 | 1257046016 |
| 22 | 2929852416 |
| 23 | 6789267456 |
| 24 | 15648423936 |
| 25 | 35888562176 |
| 26 | 81927340032 |