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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 15 |
| 6 | 30 |
| 7 | 63 |
| 8 | 128 |
| 9 | 252 |
| 10 | 510 |
| 11 | 1023 |
| 12 | 2040 |
| 13 | 4095 |
| 14 | 8190 |
| 15 | 16365 |
| 16 | 32768 |
| 17 | 65535 |
| 18 | 131040 |
| 19 | 262143 |
| 20 | 524280 |
| 21 | 1048509 |
| 22 | 2097150 |
| 23 | 4194303 |
| 24 | 8388480 |
| 25 | 16777200 |
| 26 | 33554430 |
| 27 | 67108608 |
| 28 | 134217720 |
| 29 | 268435455 |
| 30 | 536870370 |
| 31 | 1073741823 |
| 32 | 2147483648 |
| 33 | 4294966269 |
| 34 | 8589934590 |