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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 1010 |
| 6 | 61610 |
| 7 | 469730 |
| 8 | 2037190 |
| 9 | 3820821 |
| 10 | 9227438 |
| 11 | 21728810 |
| 12 | 24372562 |
| 13 | 207034456857 |
| 14 | 1957657325241 |
| 15 | 2002159320610 |
| 16 | 35169368880130 |
| 17 | 36496347203230 |
| 18 | 116800477091426 |