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 | 1 |
| 1 | 4 |
| 2 | 12 |
| 3 | 36 |
| 4 | 100 |
| 5 | 300 |
| 6 | 776 |
| 7 | 2412 |
| 8 | 6304 |
| 9 | 19036 |
| 10 | 50952 |
| 11 | 148896 |
| 12 | 393452 |
| 13 | 1211444 |
| 14 | 3167004 |
| 15 | 9672772 |
| 16 | 25295248 |
| 17 | 76084796 |
| 18 | 200590424 |
| 19 | 608621376 |
| 20 | 1617201648 |
| 21 | 4908511140 |
| 22 | 12658776540 |
| 23 | 38907904188 |
| 24 | 102775961200 |
| 25 | 310485090044 |