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 | 0 |
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 2 |
| 10 | 4 |
| 11 | 8 |
| 12 | 16 |
| 13 | 32 |
| 14 | 64 |
| 15 | 127 |
| 16 | 254 |
| 17 | 507 |
| 18 | 1012 |
| 19 | 2020 |
| 20 | 4032 |
| 21 | 8048 |
| 22 | 16064 |
| 23 | 32064 |
| 24 | 64001 |
| 25 | 127748 |
| 26 | 254989 |
| 27 | 508966 |
| 28 | 1015912 |
| 29 | 2027792 |
| 30 | 4047536 |
| 31 | 8079008 |
| 32 | 16125952 |
| 33 | 32187903 |
| 34 | 64248058 |
| 35 | 128241127 |
| 36 | 255973288 |
| 37 | 510930664 |
| 38 | 1019833536 |
| 39 | 2035619536 |