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 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 4 |
| 8 | 7 |
| 9 | 9 |
| 10 | 21 |
| 11 | 41 |
| 12 | 73 |
| 13 | 147 |
| 14 | 288 |
| 15 | 557 |
| 16 | 1111 |
| 17 | 2193 |
| 18 | 4343 |
| 19 | 8728 |
| 20 | 17483 |
| 21 | 35063 |
| 22 | 70828 |
| 23 | 143267 |
| 24 | 290193 |
| 25 | 589705 |
| 26 | 1200646 |
| 27 | 2448904 |
| 28 | 5005001 |
| 29 | 10245216 |
| 30 | 21005238 |
| 31 | 43134355 |
| 32 | 88696073 |
| 33 | 182621943 |
| 34 | 376496023 |
| 35 | 777098691 |
| 36 | 1605731742 |
| 37 | 3321492918 |
| 38 | 6877489184 |