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 | 0 |
| 1 | 1 |
| 2 | 14 |
| 3 | 130 |
| 4 | 700 |
| 5 | 2635 |
| 6 | 7826 |
| 7 | 19684 |
| 8 | 43800 |
| 9 | 88725 |
| 10 | 166870 |
| 11 | 295526 |
| 12 | 498004 |
| 13 | 804895 |
| 14 | 1255450 |
| 15 | 1899080 |
| 16 | 2796976 |
| 17 | 4023849 |
| 18 | 5669790 |
| 19 | 7842250 |
| 20 | 10668140 |
| 21 | 14296051 |
| 22 | 18898594 |
| 23 | 24674860 |
| 24 | 31853000 |
| 25 | 40692925 |
| 26 | 51489126 |
| 27 | 64573614 |