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 | 140 |
| 4 | 1435 |
| 5 | 7693 |
| 6 | 30450 |
| 7 | 100330 |
| 8 | 291265 |
| 9 | 769015 |
| 10 | 1883436 |
| 11 | 4336320 |
| 12 | 9475195 |
| 13 | 19790605 |
| 14 | 39733150 |
| 15 | 77020830 |
| 16 | 144681850 |
| 17 | 264178990 |
| 18 | 470096240 |
| 19 | 817045500 |
| 20 | 1389681375 |
| 21 | 2317008105 |
| 22 | 3792539410 |
| 23 | 6102347050 |
| 24 | 9663627675 |
| 25 | 15077153821 |
| 26 | 23197881100 |