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 | 36 |
| 3 | 72 |
| 4 | 180 |
| 5 | 432 |
| 6 | 1044 |
| 7 | 2520 |
| 8 | 6084 |
| 9 | 14688 |
| 10 | 35460 |
| 11 | 85608 |
| 12 | 206676 |
| 13 | 498960 |
| 14 | 1204596 |
| 15 | 2908152 |
| 16 | 7020900 |
| 17 | 16949952 |
| 18 | 40920804 |
| 19 | 98791560 |
| 20 | 238503924 |
| 21 | 575799408 |
| 22 | 1390102740 |
| 23 | 3356004888 |
| 24 | 8102112516 |
| 25 | 19560229920 |
| 26 | 47222572356 |
| 27 | 114005374632 |