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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 2 |
| 12 | 3 |
| 13 | 6 |
| 14 | 12 |
| 15 | 24 |
| 16 | 48 |
| 17 | 96 |
| 18 | 192 |
| 19 | 384 |
| 20 | 768 |
| 21 | 1535 |
| 22 | 3068 |
| 23 | 6133 |
| 24 | 12260 |
| 25 | 24508 |
| 26 | 48992 |
| 27 | 97936 |
| 28 | 195776 |
| 29 | 391360 |
| 30 | 782336 |
| 31 | 1563904 |
| 32 | 3126273 |
| 33 | 6249478 |
| 34 | 12492823 |
| 35 | 24973386 |
| 36 | 49922264 |
| 37 | 99795536 |
| 38 | 199493136 |
| 39 | 398790496 |
| 40 | 797189632 |
| 41 | 1593596928 |