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 | 1 |
| 1 | 12 |
| 2 | 80 |
| 3 | 400 |
| 4 | 1664 |
| 5 | 6056 |
| 6 | 19904 |
| 7 | 60320 |
| 8 | 171008 |
| 9 | 458428 |
| 10 | 1171552 |
| 11 | 2872368 |
| 12 | 6790656 |
| 13 | 15544136 |
| 14 | 34568576 |
| 15 | 74901984 |
| 16 | 158507008 |
| 17 | 328277848 |
| 18 | 666568592 |
| 19 | 1329014992 |
| 20 | 2605464320 |
| 21 | 5028397952 |
| 22 | 9563654976 |
| 23 | 17942323424 |
| 24 | 33232441344 |
| 25 | 60814373780 |
| 26 | 110029864416 |