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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 36 |
| 5 | 62 |
| 6 | 106 |
| 7 | 184 |
| 8 | 328 |
| 9 | 602 |
| 10 | 1134 |
| 11 | 2180 |
| 12 | 4252 |
| 13 | 8374 |
| 14 | 16594 |
| 15 | 33008 |
| 16 | 65808 |
| 17 | 131378 |
| 18 | 262486 |
| 19 | 524668 |
| 20 | 1048996 |
| 21 | 2097614 |
| 22 | 4194810 |
| 23 | 8389160 |
| 24 | 16777816 |
| 25 | 33555082 |
| 26 | 67109566 |
| 27 | 134218484 |
| 28 | 268436268 |
| 29 | 536871782 |
| 30 | 1073742754 |
| 31 | 2147484640 |