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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 14 |
| 7 | 31 |
| 8 | 60 |
| 9 | 126 |
| 10 | 248 |
| 11 | 511 |
| 12 | 1005 |
| 13 | 2047 |
| 14 | 4064 |
| 15 | 8183 |
| 16 | 16320 |
| 17 | 32767 |
| 18 | 65394 |
| 19 | 131071 |
| 20 | 261885 |
| 21 | 524255 |
| 22 | 1048064 |
| 23 | 2097151 |
| 24 | 4193220 |
| 25 | 8388600 |
| 26 | 16775168 |
| 27 | 33554304 |
| 28 | 67104765 |
| 29 | 134217727 |
| 30 | 268427002 |
| 31 | 536870911 |
| 32 | 1073725440 |
| 33 | 2147483135 |