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 | 12 |
| 2 | 68 |
| 3 | 284 |
| 4 | 998 |
| 5 | 3092 |
| 6 | 8724 |
| 7 | 22904 |
| 8 | 56679 |
| 9 | 133516 |
| 10 | 301664 |
| 11 | 657368 |
| 12 | 1387854 |
| 13 | 2849168 |
| 14 | 5704476 |
| 15 | 11166464 |
| 16 | 21415632 |
| 17 | 40312176 |
| 18 | 74593476 |
| 19 | 135864792 |
| 20 | 243872632 |
| 21 | 431835140 |
| 22 | 755039948 |
| 23 | 1304589104 |
| 24 | 2229192801 |
| 25 | 3769452152 |
| 26 | 6311385252 |
| 27 | 10469412968 |
| 28 | 17214152072 |