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 | 4 |
| 2 | 14 |
| 3 | 60 |
| 4 | 225 |
| 5 | 796 |
| 6 | 2764 |
| 7 | 9304 |
| 8 | 30580 |
| 9 | 98700 |
| 10 | 313422 |
| 11 | 981548 |
| 12 | 3037473 |
| 13 | 9301620 |
| 14 | 28222000 |
| 15 | 84927760 |
| 16 | 253699285 |
| 17 | 752863840 |
| 18 | 2220831160 |
| 19 | 6515581600 |
| 20 | 19021079866 |
| 21 | 55276625304 |
| 22 | 159967084164 |
| 23 | 461150383400 |
| 24 | 1324652146775 |
| 25 | 3792447499916 |
| 26 | 10824189204014 |