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 | 1 |
| 9 | 2 |
| 10 | 3 |
| 11 | 6 |
| 12 | 12 |
| 13 | 24 |
| 14 | 48 |
| 15 | 96 |
| 16 | 192 |
| 17 | 383 |
| 18 | 764 |
| 19 | 1525 |
| 20 | 3044 |
| 21 | 6076 |
| 22 | 12128 |
| 23 | 24208 |
| 24 | 48320 |
| 25 | 96448 |
| 26 | 192513 |
| 27 | 384262 |
| 28 | 766999 |
| 29 | 1530954 |
| 30 | 3055832 |
| 31 | 6099536 |
| 32 | 12174864 |
| 33 | 24301408 |
| 34 | 48506368 |
| 35 | 96820223 |
| 36 | 193256184 |
| 37 | 385745369 |
| 38 | 769959784 |
| 39 | 1536863736 |
| 40 | 3067627936 |