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 | 4 |
| 4 | 12 |
| 5 | 44 |
| 6 | 176 |
| 7 | 788 |
| 8 | 3936 |
| 9 | 23264 |
| 10 | 152112 |
| 11 | 1104876 |
| 12 | 8725320 |
| 13 | 74715908 |
| 14 | 687915040 |
| 15 | 6782261964 |
| 16 | 71294227456 |
| 17 | 796138700016 |
| 18 | 9409401651840 |
| 19 | 117378774461812 |