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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 11 |
| 7 | 24 |
| 8 | 51 |
| 9 | 112 |
| 10 | 233 |
| 11 | 507 |
| 12 | 1044 |
| 13 | 2214 |
| 14 | 4557 |
| 15 | 9472 |
| 16 | 19545 |
| 17 | 40373 |
| 18 | 82145 |
| 19 | 168374 |
| 20 | 341523 |
| 21 | 693350 |
| 22 | 1408893 |
| 23 | 2860365 |
| 24 | 5771355 |
| 25 | 11667351 |
| 26 | 23542022 |
| 27 | 47484577 |
| 28 | 95861243 |
| 29 | 193447849 |
| 30 | 389602553 |