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 | 5 |
| 2 | 10 |
| 3 | 18 |
| 4 | 36 |
| 5 | 66 |
| 6 | 132 |
| 7 | 244 |
| 8 | 488 |
| 9 | 906 |
| 10 | 1812 |
| 11 | 3372 |
| 12 | 6744 |
| 13 | 12566 |
| 14 | 25132 |
| 15 | 46860 |
| 16 | 93720 |
| 17 | 174810 |
| 18 | 349620 |
| 19 | 652252 |
| 20 | 1304504 |
| 21 | 2433942 |
| 22 | 4867884 |
| 23 | 9083004 |
| 24 | 18166008 |
| 25 | 33897050 |
| 26 | 67794100 |
| 27 | 126503148 |
| 28 | 253006296 |
| 29 | 472111446 |
| 30 | 944222892 |
| 31 | 1761934444 |
| 32 | 3523868888 |