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 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 44 |
| 6 | 120 |
| 7 | 348 |
| 8 | 1064 |
| 9 | 3368 |
| 10 | 10952 |
| 11 | 36336 |
| 12 | 122570 |
| 13 | 419104 |
| 14 | 1449672 |
| 15 | 5064240 |
| 16 | 17844558 |
| 17 | 63356072 |
| 18 | 226459120 |
| 19 | 814323856 |
| 20 | 2944055592 |
| 21 | 10695723368 |
| 22 | 39029679176 |
| 23 | 142998497292 |
| 24 | 525862368660 |
| 25 | 1940381764088 |
| 26 | 7182278240848 |