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 | 2 |
| 2 | 5 |
| 3 | 18 |
| 4 | 105 |
| 5 | 946 |
| 6 | 12589 |
| 7 | 240482 |
| 8 | 6526289 |
| 9 | 250119330 |
| 10 | 13512676053 |
| 11 | 1027978959346 |
| 12 | 110155994874553 |
| 13 | 16631509898085074 |
| 14 | 3540687511804739837 |
| 15 | 1063409634646294541250 |
| 16 | 450894476653951603096737 |