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 | 8 |
| 2 | 80 |
| 3 | 664 |
| 4 | 5344 |
| 5 | 42792 |
| 6 | 342384 |
| 7 | 2739128 |
| 8 | 21913088 |
| 9 | 175304776 |
| 10 | 1402438288 |
| 11 | 11219506392 |
| 12 | 89756051232 |
| 13 | 718048409960 |
| 14 | 5744387279792 |
| 15 | 45955098238456 |
| 16 | 367640785907776 |
| 17 | 2941126287262344 |
| 18 | 23529010298098896 |
| 19 | 188232082384791320 |