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 | 4 |
| 2 | 47 |
| 3 | 240 |
| 4 | 831 |
| 5 | 2282 |
| 6 | 5362 |
| 7 | 11256 |
| 8 | 21690 |
| 9 | 39072 |
| 10 | 66649 |
| 11 | 108680 |
| 12 | 170625 |
| 13 | 259350 |
| 14 | 383348 |
| 15 | 552976 |
| 16 | 780708 |
| 17 | 1081404 |
| 18 | 1472595 |
| 19 | 1974784 |
| 20 | 2611763 |
| 21 | 3410946 |
| 22 | 4403718 |
| 23 | 5625800 |
| 24 | 7117630 |
| 25 | 8924760 |
| 26 | 11098269 |
| 27 | 13695192 |
| 28 | 16778965 |
| 29 | 20419886 |
| 30 | 24695592 |
| 31 | 29691552 |
| 32 | 35501576 |