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 | 0 |
| 1 | 4 |
| 2 | 14 |
| 3 | 114 |
| 4 | 364 |
| 5 | 989 |
| 6 | 13489 |
| 7 | 13489 |
| 8 | 169739 |
| 9 | 560364 |
| 10 | 2513489 |
| 11 | 2513489 |
| 12 | 2513489 |
| 13 | 246654114 |
| 14 | 3908763489 |
| 15 | 22219310364 |
| 16 | 52736888489 |
| 17 | 52736888489 |
| 18 | 3104494700989 |
| 19 | 6919191966614 |