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 | 3 |
| 2 | 18 |
| 3 | 169 |
| 4 | 2190 |
| 5 | 36360 |
| 6 | 737051 |
| 7 | 17645187 |
| 8 | 487025244 |
| 9 | 15219471545 |
| 10 | 530951735025 |
| 11 | 20447695079658 |
| 12 | 861389893507518 |
| 13 | 39394187817328680 |
| 14 | 1943446826192453505 |
| 15 | 102863050524539640435 |
| 16 | 5813722327999905078450 |