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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 18 |
| 10 | 20 |
| 11 | 66 |
| 12 | 120 |
| 13 | 260 |
| 14 | 420 |
| 15 | 900 |
| 16 | 1408 |
| 17 | 2652 |
| 18 | 4284 |
| 19 | 7676 |
| 20 | 12400 |
| 21 | 21546 |
| 22 | 34584 |
| 23 | 58742 |
| 24 | 94896 |
| 25 | 158400 |
| 26 | 255632 |
| 27 | 422874 |
| 28 | 683144 |
| 29 | 1121256 |
| 30 | 1812480 |
| 31 | 2960872 |
| 32 | 4787712 |
| 33 | 7796184 |
| 34 | 12608220 |
| 35 | 20487110 |
| 36 | 33139440 |
| 37 | 53768252 |
| 38 | 86981924 |
| 39 | 140995764 |