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 | 4 |
| 3 | 84 |
| 4 | 452 |
| 5 | 1772 |
| 6 | 5596 |
| 7 | 14888 |
| 8 | 34640 |
| 9 | 72712 |
| 10 | 140716 |
| 11 | 255036 |
| 12 | 437968 |
| 13 | 718980 |
| 14 | 1136092 |
| 15 | 1737376 |
| 16 | 2582576 |
| 17 | 3744848 |
| 18 | 5312620 |
| 19 | 7391572 |
| 20 | 10106736 |
| 21 | 13604716 |
| 22 | 18056028 |
| 23 | 23657560 |
| 24 | 30635152 |
| 25 | 39246296 |
| 26 | 49782956 |
| 27 | 62574508 |
| 28 | 77990800 |