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 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 4 |
| 9 | 5 |
| 10 | 9 |
| 11 | 15 |
| 12 | 26 |
| 13 | 45 |
| 14 | 77 |
| 15 | 137 |
| 16 | 243 |
| 17 | 434 |
| 18 | 774 |
| 19 | 1408 |
| 20 | 2554 |
| 21 | 4667 |
| 22 | 8627 |
| 23 | 15927 |
| 24 | 29559 |
| 25 | 54867 |
| 26 | 101688 |
| 27 | 189425 |
| 28 | 355315 |
| 29 | 668598 |
| 30 | 1264180 |
| 31 | 2395462 |
| 32 | 4506221 |
| 33 | 8507311 |
| 34 | 16084405 |
| 35 | 30545142 |
| 36 | 57898862 |
| 37 | 110199367 |
| 38 | 209957460 |
| 39 | 400430494 |
| 40 | 765333684 |