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 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 28 |
| 4 | 104 |
| 5 | 332 |
| 6 | 1032 |
| 7 | 2983 |
| 8 | 8384 |
| 9 | 22622 |
| 10 | 59479 |
| 11 | 151902 |
| 12 | 379616 |
| 13 | 927521 |
| 14 | 2224100 |
| 15 | 5236410 |
| 16 | 12130549 |
| 17 | 27669296 |
| 18 | 62229605 |
| 19 | 138095206 |
| 20 | 302672402 |
| 21 | 655627183 |
| 22 | 1404598865 |
| 23 | 2977830134 |
| 24 | 6251059210 |
| 25 | 12999297747 |
| 26 | 26791987616 |
| 27 | 54750232180 |
| 28 | 110977385294 |
| 29 | 223204454700 |
| 30 | 445590973235 |