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 | 6 |
| 2 | 27 |
| 3 | 104 |
| 4 | 366 |
| 5 | 1212 |
| 6 | 3842 |
| 7 | 11784 |
| 8 | 35223 |
| 9 | 103122 |
| 10 | 296805 |
| 11 | 842160 |
| 12 | 2360780 |
| 13 | 6549240 |
| 14 | 18004980 |
| 15 | 49106992 |
| 16 | 132996957 |
| 17 | 357948894 |
| 18 | 957993823 |
| 19 | 2550977112 |
| 20 | 6761742234 |
| 21 | 17848312884 |
| 22 | 46932923478 |
| 23 | 122980461816 |