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 | 13 |
| 3 | 37 |
| 4 | 85 |
| 5 | 181 |
| 6 | 373 |
| 7 | 757 |
| 8 | 1525 |
| 9 | 3061 |
| 10 | 6133 |
| 11 | 12277 |
| 12 | 24565 |
| 13 | 49141 |
| 14 | 98293 |
| 15 | 196597 |
| 16 | 393205 |
| 17 | 786421 |
| 18 | 1572853 |
| 19 | 3145717 |
| 20 | 6291445 |
| 21 | 12582901 |
| 22 | 25165813 |
| 23 | 50331637 |
| 24 | 100663285 |
| 25 | 201326581 |
| 26 | 402653173 |
| 27 | 805306357 |
| 28 | 1610612725 |
| 29 | 3221225461 |
| 30 | 6442450933 |
| 31 | 12884901877 |