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 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 15 |
| 4 | 59 |
| 5 | 95 |
| 6 | 223 |
| 7 | 255 |
| 8 | 1007 |
| 9 | 1919 |
| 10 | 4091 |
| 11 | 6143 |
| 12 | 16379 |
| 13 | 28671 |
| 14 | 61439 |
| 15 | 65535 |
| 16 | 261119 |
| 17 | 516095 |
| 18 | 1048571 |
| 19 | 1966079 |
| 20 | 4128767 |
| 21 | 8380415 |
| 22 | 16769023 |
| 23 | 25165823 |
| 24 | 67108799 |
| 25 | 134184959 |
| 26 | 268434431 |
| 27 | 469762047 |
| 28 | 1073741819 |
| 29 | 2013265919 |
| 30 | 4160749567 |
| 31 | 4294967295 |
| 32 | 17163091967 |