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 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 713 |
| 5 | 47283 |
| 6 | 5301453 |
| 7 | 862284559 |
| 8 | 190869905951 |
| 9 | 55139769554236 |
| 10 | 20148062989955675 |
| 11 | 9084944524391553737 |
| 12 | 4955080153387098326546 |
| 13 | 3215465859346835309769199 |
| 14 | 2448347575754387175150096999 |
| 15 | 2161727686219210764644850060171 |