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 | 6 |
| 3 | 12 |
| 4 | 28 |
| 5 | 58 |
| 6 | 126 |
| 7 | 252 |
| 8 | 506 |
| 9 | 1012 |
| 10 | 2042 |
| 11 | 4082 |
| 12 | 8190 |
| 13 | 16366 |
| 14 | 32742 |
| 15 | 65518 |
| 16 | 131056 |
| 17 | 262114 |
| 18 | 524280 |
| 19 | 1048554 |
| 20 | 2097146 |
| 21 | 4194278 |
| 22 | 8388594 |
| 23 | 16777208 |
| 24 | 33554390 |
| 25 | 67108858 |
| 26 | 134217716 |
| 27 | 268435396 |
| 28 | 536870852 |
| 29 | 1073741814 |
| 30 | 2147483614 |
| 31 | 4294967284 |
| 32 | 8589934580 |
| 33 | 17179869158 |