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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 2 |
| 11 | 4 |
| 12 | 8 |
| 13 | 16 |
| 14 | 32 |
| 15 | 63 |
| 16 | 126 |
| 17 | 252 |
| 18 | 504 |
| 19 | 1007 |
| 20 | 2012 |
| 21 | 4020 |
| 22 | 8032 |
| 23 | 16048 |
| 24 | 32064 |
| 25 | 64065 |
| 26 | 128004 |
| 27 | 255756 |
| 28 | 511008 |
| 29 | 1021009 |
| 30 | 2040006 |
| 31 | 4075992 |
| 32 | 8143952 |
| 33 | 16271856 |
| 34 | 32511648 |
| 35 | 64959231 |
| 36 | 129790458 |
| 37 | 259325160 |
| 38 | 518139312 |
| 39 | 1035257615 |
| 40 | 2068475224 |