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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 9 |
| 7 | 19 |
| 8 | 37 |
| 9 | 74 |
| 10 | 148 |
| 11 | 296 |
| 12 | 591 |
| 13 | 1183 |
| 14 | 2366 |
| 15 | 4731 |
| 16 | 9463 |
| 17 | 18926 |
| 18 | 37852 |
| 19 | 75704 |
| 20 | 151408 |
| 21 | 302816 |
| 22 | 605633 |
| 23 | 1211265 |
| 24 | 2422530 |
| 25 | 4845060 |
| 26 | 9690121 |
| 27 | 19380241 |
| 28 | 38760482 |
| 29 | 77520964 |
| 30 | 155041928 |
| 31 | 310083856 |
| 32 | 620167712 |
| 33 | 1240335424 |
| 34 | 2480670848 |
| 35 | 4961341695 |
| 36 | 9922683391 |
| 37 | 19845366782 |
| 38 | 39690733564 |