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 | 3 |
| 1 | 5 |
| 2 | 11 |
| 3 | 21 |
| 4 | 40 |
| 5 | 81 |
| 6 | 161 |
| 7 | 324 |
| 8 | 647 |
| 9 | 1293 |
| 10 | 2587 |
| 11 | 5172 |
| 12 | 10346 |
| 13 | 20691 |
| 14 | 41380 |
| 15 | 82761 |
| 16 | 165521 |
| 17 | 331045 |
| 18 | 662088 |
| 19 | 1324177 |
| 20 | 2648354 |
| 21 | 5296706 |
| 22 | 10593414 |
| 23 | 21186826 |
| 24 | 42373653 |
| 25 | 84747305 |
| 26 | 169494608 |
| 27 | 338989217 |
| 28 | 677978434 |
| 29 | 1355956869 |
| 30 | 2711913737 |
| 31 | 5423827472 |
| 32 | 10847654948 |
| 33 | 21695309895 |
| 34 | 43390619792 |
| 35 | 86781239585 |
| 36 | 173562479173 |
| 37 | 347124958345 |