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 | 3 |
| 1 | 14 |
| 2 | 74 |
| 3 | 434 |
| 4 | 2738 |
| 5 | 18074 |
| 6 | 122474 |
| 7 | 842114 |
| 8 | 5836898 |
| 9 | 40635434 |
| 10 | 283582874 |
| 11 | 1981698194 |
| 12 | 13858595858 |
| 13 | 96957713594 |
| 14 | 678496291274 |
| 15 | 4748649600674 |
| 16 | 33237268583618 |
| 17 | 232647822996554 |
| 18 | 1628482704807674 |
| 19 | 11399171225541554 |