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 | 4095 |
| 3 | 265720 |
| 4 | 5592405 |
| 5 | 61035156 |
| 6 | 435356467 |
| 7 | 2306881200 |
| 8 | 9817068105 |
| 9 | 35303692060 |
| 10 | 111111111111 |
| 11 | 313842837672 |
| 12 | 810554586205 |
| 13 | 1941507093540 |
| 14 | 4361070182715 |
| 15 | 9267595563616 |
| 16 | 18764998447377 |
| 17 | 36413889826860 |