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 | 2 |
| 2 | 5 |
| 3 | 9 |
| 4 | 18 |
| 5 | 33 |
| 6 | 65 |
| 7 | 126 |
| 8 | 253 |
| 9 | 505 |
| 10 | 1018 |
| 11 | 2041 |
| 12 | 4097 |
| 13 | 8198 |
| 14 | 16405 |
| 15 | 32793 |
| 16 | 65570 |
| 17 | 131089 |
| 18 | 262145 |
| 19 | 524238 |
| 20 | 1048493 |
| 21 | 2097017 |
| 22 | 4194186 |
| 23 | 8388521 |
| 24 | 16777281 |
| 25 | 33554646 |
| 26 | 67109317 |
| 27 | 134218265 |
| 28 | 268436018 |
| 29 | 536871105 |
| 30 | 1073741505 |
| 31 | 2147482398 |