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 | 147 |
| 2 | 295 |
| 3 | 591 |
| 4 | 1183 |
| 5 | 2367 |
| 6 | 4735 |
| 7 | 9471 |
| 8 | 18943 |
| 9 | 37887 |
| 10 | 75775 |
| 11 | 151551 |
| 12 | 303103 |
| 13 | 606207 |
| 14 | 1212415 |
| 15 | 2424831 |
| 16 | 4849663 |
| 17 | 9699327 |
| 18 | 19398655 |
| 19 | 38797311 |
| 20 | 77594623 |
| 21 | 155189247 |
| 22 | 310378495 |
| 23 | 620756991 |
| 24 | 1241513983 |
| 25 | 2483027967 |
| 26 | 4966055935 |
| 27 | 9932111871 |
| 28 | 19864223743 |
| 29 | 39728447487 |
| 30 | 79456894975 |