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 | 4 |
| 2 | 9 |
| 3 | 21 |
| 4 | 46 |
| 5 | 93 |
| 6 | 187 |
| 7 | 377 |
| 8 | 755 |
| 9 | 1513 |
| 10 | 3027 |
| 11 | 6059 |
| 12 | 12127 |
| 13 | 24257 |
| 14 | 48529 |
| 15 | 97059 |
| 16 | 194127 |
| 17 | 388257 |
| 18 | 776515 |
| 19 | 1553033 |
| 20 | 3106083 |
| 21 | 6212177 |
| 22 | 12424355 |
| 23 | 24848723 |
| 24 | 49697447 |
| 25 | 99394909 |
| 26 | 198789819 |
| 27 | 397579639 |
| 28 | 795159283 |
| 29 | 1590318573 |
| 30 | 3180637153 |