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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 125 |
| 5 | 84277 |
| 6 | 1435150 |
| 7 | 9061191 |
| 8 | 249858189 |
| 9 | 2799936925 |
| 10 | 146234239784 |
| 11 | 1139643680683264 |
| 12 | 7471434609455791 |
| 13 | 21274660147684109 |
| 14 | 2911209509190673141 |
| 15 | 15845190736671957299 |
| 16 | 995980378496501932493 |
| 17 | 213688560255016550712685 |
| 18 | 28372206851301867342910959 |