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 | 40 |
| 2 | 1600 |
| 3 | 9240 |
| 4 | 30400 |
| 5 | 75400 |
| 6 | 157440 |
| 7 | 292600 |
| 8 | 499840 |
| 9 | 801000 |
| 10 | 1220800 |
| 11 | 1786840 |
| 12 | 2529600 |
| 13 | 3482440 |
| 14 | 4681600 |
| 15 | 6166200 |
| 16 | 7978240 |
| 17 | 10162600 |
| 18 | 12767040 |
| 19 | 15842200 |
| 20 | 19441600 |
| 21 | 23621640 |
| 22 | 28441600 |
| 23 | 33963640 |
| 24 | 40252800 |
| 25 | 47377000 |
| 26 | 55407040 |
| 27 | 64416600 |