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 | 7 |
| 2 | 84 |
| 3 | 504 |
| 4 | 2100 |
| 5 | 6930 |
| 6 | 19404 |
| 7 | 48048 |
| 8 | 108108 |
| 9 | 225225 |
| 10 | 440440 |
| 11 | 816816 |
| 12 | 1447992 |
| 13 | 2469012 |
| 14 | 4069800 |
| 15 | 6511680 |
| 16 | 10147368 |
| 17 | 15444891 |
| 18 | 23015916 |
| 19 | 33649000 |
| 20 | 48348300 |
| 21 | 68378310 |
| 22 | 95315220 |
| 23 | 131105520 |
| 24 | 178132500 |
| 25 | 239291325 |
| 26 | 318073392 |
| 27 | 418660704 |
| 28 | 546031024 |
| 29 | 706074600 |
| 30 | 905723280 |