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 | 30 |
| 3 | 106 |
| 4 | 292 |
| 5 | 712 |
| 6 | 1618 |
| 7 | 3518 |
| 8 | 7432 |
| 9 | 15404 |
| 10 | 31526 |
| 11 | 63986 |
| 12 | 129164 |
| 13 | 259824 |
| 14 | 521498 |
| 15 | 1045254 |
| 16 | 2093232 |
| 17 | 4189716 |
| 18 | 8383278 |
| 19 | 16771066 |
| 20 | 33547380 |
| 21 | 67100824 |
| 22 | 134208610 |
| 23 | 268425166 |
| 24 | 536859352 |
| 25 | 1073728892 |
| 26 | 2147469238 |
| 27 | 4294951298 |
| 28 | 8589916892 |