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 | 6 |
| 2 | 24 |
| 3 | 54 |
| 4 | 216 |
| 5 | 1638 |
| 6 | 6552 |
| 7 | 14256 |
| 8 | 55860 |
| 9 | 80262 |
| 10 | 276822 |
| 11 | 321048 |
| 12 | 502740 |
| 13 | 1107288 |
| 14 | 1396500 |
| 15 | 1724976 |
| 16 | 12568500 |
| 17 | 13564278 |
| 18 | 20165460 |
| 19 | 54257112 |
| 20 | 168836850 |
| 21 | 181489140 |
| 22 | 504136500 |
| 23 | 675347400 |
| 24 | 4537228500 |
| 25 | 28533427650 |
| 26 | 60950102850 |
| 27 | 114133710600 |
| 28 | 162252212850 |
| 29 | 243800411400 |
| 30 | 649008851400 |
| 31 | 734916514878 |