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 | 1 |
| 2 | 0 |
| 3 | 69 |
| 4 | 1 |
| 5 | 0 |
| 6 | 33661 |
| 7 | 988 |
| 8 | 1 |
| 9 | 0 |
| 10 | 60376809 |
| 11 | 2669683 |
| 12 | 16507 |
| 13 | 1 |
| 14 | 0 |
| 15 | 288294050521 |
| 16 | 17033188586 |
| 17 | 212734266 |
| 18 | 261626 |
| 19 | 1 |
| 20 | 0 |
| 21 | 3019098162602349 |
| 22 | 223257353561605 |
| 23 | 4297382231090 |
| 24 | 17634518610 |
| 25 | 4196345 |
| 26 | 1 |
| 27 | 0 |