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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 39 |
| 5 | 318 |
| 6 | 3242 |
| 7 | 40348 |
| 8 | 598083 |
| 9 | 10337402 |
| 10 | 204706486 |
| 11 | 4577520108 |
| 12 | 114208773268 |
| 13 | 3147671423964 |
| 14 | 95023271024164 |
| 15 | 3119560618275648 |
| 16 | 110684959354534001 |
| 17 | 4221624141483353436 |
| 18 | 172274971776090819870 |