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 | 40 |
| 4 | 368 |
| 5 | 1704 |
| 6 | 5704 |
| 7 | 15400 |
| 8 | 36096 |
| 9 | 75632 |
| 10 | 145968 |
| 11 | 263592 |
| 12 | 451392 |
| 13 | 738360 |
| 14 | 1163552 |
| 15 | 1774840 |
| 16 | 2632344 |
| 17 | 3808992 |
| 18 | 5394752 |
| 19 | 7493936 |
| 20 | 10233832 |
| 21 | 13759008 |
| 22 | 18241312 |
| 23 | 23877984 |
| 24 | 30896984 |
| 25 | 39551456 |
| 26 | 50137240 |
| 27 | 62983128 |
| 28 | 78459880 |