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 | 6 |
| 3 | 20 |
| 4 | 72 |
| 5 | 156 |
| 6 | 342 |
| 7 | 600 |
| 8 | 1056 |
| 9 | 1640 |
| 10 | 2550 |
| 11 | 3660 |
| 12 | 5256 |
| 13 | 7140 |
| 14 | 9702 |
| 15 | 12656 |
| 16 | 16512 |
| 17 | 20880 |
| 18 | 26406 |
| 19 | 32580 |
| 20 | 40200 |
| 21 | 48620 |
| 22 | 58806 |
| 23 | 69960 |
| 24 | 83232 |
| 25 | 97656 |
| 26 | 114582 |
| 27 | 132860 |
| 28 | 154056 |
| 29 | 176820 |
| 30 | 202950 |
| 31 | 230880 |
| 32 | 262656 |
| 33 | 296480 |
| 34 | 334662 |
| 35 | 375156 |
| 36 | 420552 |
| 37 | 468540 |
| 38 | 522006 |
| 39 | 578360 |
| 40 | 640800 |
| 41 | 706440 |
| 42 | 778806 |