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 | 210 |
| 1 | 3234 |
| 2 | 25872 |
| 3 | 144144 |
| 4 | 630630 |
| 5 | 2312310 |
| 6 | 7399392 |
| 7 | 21237216 |
| 8 | 55747692 |
| 9 | 135795660 |
| 10 | 310390080 |
| 11 | 671571264 |
| 12 | 1385115732 |
| 13 | 2738894004 |
| 14 | 5216940960 |
| 15 | 9610154400 |
| 16 | 17178150990 |
| 17 | 29881321470 |
| 18 | 50707697040 |
| 19 | 84126042000 |
| 20 | 136704818250 |
| 21 | 217946538810 |
| 22 | 341398774080 |
| 23 | 526116951360 |