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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 2 |
| 11 | 1 |
| 12 | 3 |
| 13 | 1 |
| 14 | 9 |
| 15 | 2 |
| 16 | 50 |
| 17 | 3 |
| 18 | 453 |
| 19 | 5 |
| 20 | 5759 |
| 21 | 14 |
| 22 | 90693 |
| 23 | 3926 |
| 24 | 1736786 |
| 25 | 4132004 |
| 26 | 163458044 |
| 27 | 4018022167 |
| 28 | 119021971966 |