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 | 3 |
| 4 | 14 |
| 5 | 80 |
| 6 | 559 |
| 7 | 4599 |
| 8 | 43665 |
| 9 | 470196 |
| 10 | 5666586 |
| 11 | 75600690 |
| 12 | 1106587008 |
| 13 | 17636532264 |
| 14 | 304092954138 |
| 15 | 5640892517610 |
| 16 | 112029356591862 |
| 17 | 2371963759970352 |
| 18 | 53338181764577304 |
| 19 | 1269586152655203672 |
| 20 | 31891196481381667008 |
| 21 | 843109673024218773600 |
| 22 | 23400930987874505081160 |