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 | 666 |
| 5 | 36975 |
| 6 | 437517 |
| 7 | 2667375 |
| 8 | 11225145 |
| 9 | 37206936 |
| 10 | 104285790 |
| 11 | 257991042 |
| 12 | 579308220 |
| 13 | 1203756165 |
| 14 | 2347234131 |
| 15 | 4340067705 |
| 16 | 7670818467 |
| 17 | 13041558390 |
| 18 | 21436446060 |
| 19 | 34205577876 |
| 20 | 53166223470 |
| 21 | 80723690667 |
| 22 | 120014201385 |
| 23 | 175072295955 |
| 24 | 251025419421 |