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 | 54 |
| 4 | 2968 |
| 5 | 25716 |
| 6 | 87432 |
| 7 | 209700 |
| 8 | 399524 |
| 9 | 668522 |
| 10 | 1010572 |
| 11 | 1430378 |
| 12 | 1921532 |
| 13 | 2485628 |
| 14 | 3120300 |
| 15 | 3825896 |
| 16 | 4601996 |
| 17 | 5448634 |
| 18 | 6365780 |
| 19 | 7353434 |
| 20 | 8411596 |
| 21 | 9540266 |
| 22 | 10739444 |
| 23 | 12009130 |
| 24 | 13349324 |
| 25 | 14760026 |
| 26 | 16241236 |
| 27 | 17792954 |
| 28 | 19415180 |
| 29 | 21107914 |