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 | 2 |
| 2 | 6 |
| 3 | 16 |
| 4 | 46 |
| 5 | 132 |
| 6 | 388 |
| 7 | 1152 |
| 8 | 3462 |
| 9 | 10492 |
| 10 | 32036 |
| 11 | 98400 |
| 12 | 303756 |
| 13 | 941576 |
| 14 | 2928936 |
| 15 | 9138176 |
| 16 | 28584006 |
| 17 | 89609196 |
| 18 | 281466916 |
| 19 | 885620576 |
| 20 | 2790812196 |
| 21 | 8806560056 |
| 22 | 27823745016 |
| 23 | 88005102336 |
| 24 | 278637450396 |
| 25 | 883024243032 |
| 26 | 2800748951208 |