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 | 12 |
| 2 | 109 |
| 3 | 888 |
| 4 | 6841 |
| 5 | 51012 |
| 6 | 372709 |
| 7 | 2687088 |
| 8 | 19200241 |
| 9 | 136354812 |
| 10 | 964249309 |
| 11 | 6798573288 |
| 12 | 47834153641 |
| 13 | 336059778612 |
| 14 | 2358521965909 |
| 15 | 16540171339488 |
| 16 | 115933787267041 |
| 17 | 812299450322412 |
| 18 | 5689910849522509 |