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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 10 |
| 6 | 22 |
| 7 | 44 |
| 8 | 91 |
| 9 | 182 |
| 10 | 370 |
| 11 | 740 |
| 12 | 1490 |
| 13 | 2980 |
| 14 | 5980 |
| 15 | 11960 |
| 16 | 23957 |
| 17 | 47914 |
| 18 | 95902 |
| 19 | 191804 |
| 20 | 383750 |
| 21 | 767500 |
| 22 | 1535284 |
| 23 | 3070568 |
| 24 | 6141694 |
| 25 | 12283388 |
| 26 | 24567892 |
| 27 | 49135784 |
| 28 | 98273780 |
| 29 | 196547560 |
| 30 | 393099544 |
| 31 | 786199088 |
| 32 | 1572406987 |
| 33 | 3144813974 |