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 | 4 |
| 2 | 14 |
| 3 | 26 |
| 4 | 72 |
| 5 | 142 |
| 6 | 362 |
| 7 | 778 |
| 8 | 1938 |
| 9 | 4366 |
| 10 | 10628 |
| 11 | 24532 |
| 12 | 59138 |
| 13 | 138680 |
| 14 | 333014 |
| 15 | 788374 |
| 16 | 1890870 |
| 17 | 4503208 |
| 18 | 10803262 |
| 19 | 25831504 |
| 20 | 62025512 |
| 21 | 148725902 |
| 22 | 357516682 |
| 23 | 859055042 |
| 24 | 2067463940 |
| 25 | 4975921904 |
| 26 | 11988835382 |
| 27 | 28892947100 |
| 28 | 69685951942 |