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 | -1 |
| 3 | 12 |
| 4 | 75 |
| 5 | 248 |
| 6 | 615 |
| 7 | 1284 |
| 8 | 2387 |
| 9 | 4080 |
| 10 | 6543 |
| 11 | 9980 |
| 12 | 14619 |
| 13 | 20712 |
| 14 | 28535 |
| 15 | 38388 |
| 16 | 50595 |
| 17 | 65504 |
| 18 | 83487 |
| 19 | 104940 |
| 20 | 130283 |
| 21 | 159960 |
| 22 | 194439 |
| 23 | 234212 |
| 24 | 279795 |
| 25 | 331728 |
| 26 | 390575 |
| 27 | 456924 |
| 28 | 531387 |
| 29 | 614600 |
| 30 | 707223 |
| 31 | 809940 |
| 32 | 923459 |
| 33 | 1048512 |
| 34 | 1185855 |
| 35 | 1336268 |
| 36 | 1500555 |
| 37 | 1679544 |
| 38 | 1874087 |
| 39 | 2085060 |