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 | 144 |
| 2 | 4194 |
| 3 | 50832 |
| 4 | 361602 |
| 5 | 1801872 |
| 6 | 6976866 |
| 7 | 22413456 |
| 8 | 62407170 |
| 9 | 155242640 |
| 10 | 352624482 |
| 11 | 743284368 |
| 12 | 1471858818 |
| 13 | 2764261008 |
| 14 | 4960898658 |
| 15 | 8559218832 |
| 16 | 14267189250 |
| 17 | 23069454480 |
| 18 | 36308034146 |
| 19 | 55779559056 |
| 20 | 83851169922 |
| 21 | 123597332112 |
| 22 | 178959948642 |
| 23 | 254934282384 |
| 24 | 357783327234 |