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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 30 |
| 6 | 60 |
| 7 | 119 |
| 8 | 237 |
| 9 | 472 |
| 10 | 940 |
| 11 | 1874 |
| 12 | 3740 |
| 13 | 7469 |
| 14 | 14918 |
| 15 | 29805 |
| 16 | 59561 |
| 17 | 119043 |
| 18 | 237966 |
| 19 | 475750 |
| 20 | 951213 |
| 21 | 1901981 |
| 22 | 3803271 |
| 23 | 7605468 |
| 24 | 15209251 |
| 25 | 30415896 |
| 26 | 60827703 |
| 27 | 121648985 |
| 28 | 243287862 |
| 29 | 486559789 |
| 30 | 973094453 |
| 31 | 1946149237 |