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 | 0 |
| 2 | 9 |
| 3 | 9 |
| 4 | 153 |
| 5 | 369 |
| 6 | 3393 |
| 7 | 12609 |
| 8 | 89145 |
| 9 | 415161 |
| 10 | 2614689 |
| 11 | 13684977 |
| 12 | 82237185 |
| 13 | 457154577 |
| 14 | 2704775985 |
| 15 | 15524314425 |
| 16 | 91659251961 |