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 | 3 |
| 2 | 12 |
| 3 | 37 |
| 4 | 114 |
| 5 | 312 |
| 6 | 855 |
| 7 | 2178 |
| 8 | 5496 |
| 9 | 13302 |
| 10 | 31719 |
| 11 | 73482 |
| 12 | 168086 |
| 13 | 375984 |
| 14 | 830976 |
| 15 | 1805887 |
| 16 | 3880746 |
| 17 | 8225460 |
| 18 | 17262440 |
| 19 | 35809446 |
| 20 | 73621776 |
| 21 | 149875003 |
| 22 | 302635110 |
| 23 | 605861124 |
| 24 | 1204043358 |
| 25 | 2374645746 |