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 | 84 |
| 4 | 192 |
| 5 | 450 |
| 6 | 972 |
| 7 | 2040 |
| 8 | 4278 |
| 9 | 8910 |
| 10 | 18462 |
| 11 | 38214 |
| 12 | 79044 |
| 13 | 163386 |
| 14 | 337638 |
| 15 | 697668 |
| 16 | 1441488 |
| 17 | 2978208 |
| 18 | 6153084 |
| 19 | 12712374 |
| 20 | 26263824 |
| 21 | 54261060 |
| 22 | 112103226 |
| 23 | 231604842 |
| 24 | 478494570 |
| 25 | 988567506 |
| 26 | 2042375592 |
| 27 | 4219537710 |
| 28 | 8717543538 |