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 | 1 |
| 2 | 140 |
| 3 | 270 |
| 4 | 672 |
| 5 | 1638 |
| 6 | 2970 |
| 7 | 6200 |
| 8 | 8190 |
| 9 | 18600 |
| 10 | 18620 |
| 11 | 27846 |
| 12 | 30240 |
| 13 | 32760 |
| 14 | 55860 |
| 15 | 105664 |
| 16 | 117800 |
| 17 | 167400 |
| 18 | 173600 |
| 19 | 237510 |
| 20 | 242060 |
| 21 | 332640 |
| 22 | 360360 |
| 23 | 539400 |
| 24 | 695520 |
| 25 | 726180 |
| 26 | 753480 |
| 27 | 950976 |
| 28 | 1089270 |
| 29 | 1421280 |
| 30 | 1539720 |