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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 463 |
| 13 | 1717 |
| 14 | 4720 |
| 15 | 11441 |
| 16 | 25884 |
| 17 | 56135 |
| 18 | 2977313 |
| 19 | 23524737 |
| 20 | 125212889 |
| 21 | 552517341 |
| 22 | 2183244857 |
| 23 | 8025931950 |
| 24 | 124257251233 |
| 25 | 1468856487536 |
| 26 | 12433365625566 |
| 27 | 85767520652726 |
| 28 | 518324768774506 |
| 29 | 2858925345803536 |
| 30 | 26181976719735061 |