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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 12 |
| 7 | 27 |
| 8 | 54 |
| 9 | 113 |
| 10 | 228 |
| 11 | 465 |
| 12 | 934 |
| 13 | 1890 |
| 14 | 3798 |
| 15 | 7644 |
| 16 | 15350 |
| 17 | 30840 |
| 18 | 61878 |
| 19 | 124173 |
| 20 | 249008 |
| 21 | 499318 |
| 22 | 1000866 |
| 23 | 2005971 |
| 24 | 4019446 |
| 25 | 8053062 |
| 26 | 16131780 |
| 27 | 32311665 |
| 28 | 64711820 |
| 29 | 129589530 |
| 30 | 259487040 |
| 31 | 519552495 |
| 32 | 1040186358 |
| 33 | 2082408354 |