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 | 15 |
| 3 | 109 |
| 4 | 1086 |
| 5 | 14178 |
| 6 | 232906 |
| 7 | 4647006 |
| 8 | 109376595 |
| 9 | 2967406345 |
| 10 | 91130074437 |
| 11 | 3123199831983 |
| 12 | 118106517900868 |
| 13 | 4883161763750820 |
| 14 | 219076867059030300 |
| 15 | 10597531747143624820 |
| 16 | 549768536732090716371 |
| 17 | 30443800514118532762329 |