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 | 7 |
| 3 | 12 |
| 4 | 23 |
| 5 | 48 |
| 6 | 103 |
| 7 | 220 |
| 8 | 463 |
| 9 | 960 |
| 10 | 1967 |
| 11 | 3996 |
| 12 | 8071 |
| 13 | 16240 |
| 14 | 32599 |
| 15 | 65340 |
| 16 | 130847 |
| 17 | 261888 |
| 18 | 523999 |
| 19 | 1048252 |
| 20 | 2096791 |
| 21 | 4193904 |
| 22 | 8388167 |
| 23 | 16776732 |
| 24 | 33553903 |
| 25 | 67108288 |
| 26 | 134217103 |
| 27 | 268434780 |
| 28 | 536870183 |
| 29 | 1073741040 |
| 30 | 2147482807 |
| 31 | 4294966396 |
| 32 | 8589933631 |
| 33 | 17179868160 |
| 34 | 34359737279 |
| 35 | 68719475580 |