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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 32 |
| 5 | 1205 |
| 6 | 13260 |
| 7 | 74494 |
| 8 | 291708 |
| 9 | 908973 |
| 10 | 2416410 |
| 11 | 5711530 |
| 12 | 12327414 |
| 13 | 24743693 |
| 14 | 46797968 |
| 15 | 84216990 |
| 16 | 145288600 |
| 17 | 241697109 |
| 18 | 389546478 |
| 19 | 610597338 |
| 20 | 933745570 |
| 21 | 1396771845 |
| 22 | 2048393204 |
| 23 | 2950649438 |
| 24 | 4181658708 |
| 25 | 5838778525 |
| 26 | 8042209890 |
| 27 | 10939084074 |
| 28 | 14708073198 |