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 | 6 |
| 2 | 50 |
| 3 | 504 |
| 4 | 5870 |
| 5 | 76872 |
| 6 | 1111646 |
| 7 | 17522664 |
| 8 | 298133054 |
| 9 | 5433157512 |
| 10 | 105396184478 |
| 11 | 2165189912040 |
| 12 | 46901678992958 |
| 13 | 1067332196912136 |
| 14 | 25435754924426270 |
| 15 | 633014456504059368 |
| 16 | 16411191933603611198 |
| 17 | 442258823578968351624 |