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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 6 |
| 6 | 31 |
| 7 | 18 |
| 8 | 127 |
| 9 | 170 |
| 10 | 511 |
| 11 | 186 |
| 12 | 2047 |
| 13 | 630 |
| 14 | 8191 |
| 15 | 10922 |
| 16 | 32767 |
| 17 | 7710 |
| 18 | 131071 |
| 19 | 27594 |
| 20 | 524287 |
| 21 | 699050 |
| 22 | 2097151 |
| 23 | 364722 |
| 24 | 8388607 |
| 25 | 6710886 |
| 26 | 33554431 |
| 27 | 44739242 |
| 28 | 19173961 |
| 29 | 18512790 |
| 30 | 536870911 |
| 31 | 69273666 |
| 32 | 2147483647 |
| 33 | 2863311530 |
| 34 | 8589934591 |
| 35 | 34359738366 |
| 36 | 34359738367 |
| 37 | 3714566310 |