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 | 12 |
| 2 | 144 |
| 3 | 420 |
| 4 | 1736 |
| 5 | 5856 |
| 6 | 15525 |
| 7 | 45738 |
| 8 | 115368 |
| 9 | 287174 |
| 10 | 700960 |
| 11 | 1620770 |
| 12 | 3730344 |
| 13 | 8345010 |
| 14 | 18340994 |
| 15 | 39838311 |
| 16 | 85088956 |
| 17 | 179931750 |
| 18 | 376333104 |
| 19 | 779411136 |
| 20 | 1601416922 |
| 21 | 3263854675 |
| 22 | 6606700688 |
| 23 | 13288445988 |
| 24 | 26569986742 |
| 25 | 52845438100 |