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) |
|---|---|
| 0 | 0 |
| 1 | 192 |
| 2 | 7020 |
| 3 | 52808 |
| 4 | 229680 |
| 5 | 738192 |
| 6 | 1950512 |
| 7 | 4488180 |
| 8 | 9314448 |
| 9 | 17841200 |
| 10 | 32050452 |
| 11 | 54630432 |
| 12 | 89126240 |
| 13 | 140105088 |
| 14 | 213336120 |
| 15 | 315984812 |
| 16 | 456821952 |
| 17 | 646447200 |
| 18 | 897527228 |
| 19 | 1225048440 |
| 20 | 1646584272 |
| 21 | 2182577072 |
| 22 | 2856634560 |
| 23 | 3695840868 |
| 24 | 4731082160 |
| 25 | 5997386832 |