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 | 5 |
| 3 | 14 |
| 4 | 46 |
| 5 | 111 |
| 6 | 303 |
| 7 | 688 |
| 8 | 1712 |
| 9 | 3761 |
| 10 | 8881 |
| 11 | 19122 |
| 12 | 43698 |
| 13 | 92851 |
| 14 | 207539 |
| 15 | 436916 |
| 16 | 961204 |
| 17 | 2009781 |
| 18 | 4369077 |
| 19 | 9087670 |
| 20 | 19573430 |
| 21 | 40544951 |
| 22 | 86682295 |
| 23 | 178956984 |
| 24 | 380283576 |
| 25 | 782936761 |
| 26 | 1655351993 |
| 27 | 3400182458 |
| 28 | 7158278842 |