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 | 1 |
| 2 | 2 |
| 3 | 0 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 13 |
| 8 | 25 |
| 9 | 46 |
| 10 | 84 |
| 11 | 151 |
| 12 | 269 |
| 13 | 475 |
| 14 | 833 |
| 15 | 1452 |
| 16 | 2518 |
| 17 | 4347 |
| 18 | 7475 |
| 19 | 12809 |
| 20 | 21881 |
| 21 | 37274 |
| 22 | 63336 |
| 23 | 107375 |
| 24 | 181657 |
| 25 | 306743 |
| 26 | 517057 |
| 27 | 870168 |
| 28 | 1462250 |
| 29 | 2453811 |
| 30 | 4112479 |
| 31 | 6884101 |
| 32 | 11510809 |
| 33 | 19226950 |
| 34 | 32084028 |
| 35 | 53489287 |
| 36 | 89097893 |
| 37 | 148290067 |
| 38 | 246615425 |
| 39 | 409835844 |
| 40 | 680609086 |