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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 31 |
| 6 | 63 |
| 7 | 127 |
| 8 | 254 |
| 9 | 502 |
| 10 | 978 |
| 11 | 1882 |
| 12 | 3600 |
| 13 | 6904 |
| 14 | 13380 |
| 15 | 26332 |
| 16 | 52664 |
| 17 | 106744 |
| 18 | 218232 |
| 19 | 447736 |
| 20 | 917760 |
| 21 | 1873312 |
| 22 | 3799920 |
| 23 | 7653136 |
| 24 | 15306272 |
| 25 | 30429856 |
| 26 | 60234528 |
| 27 | 118956831 |
| 28 | 234885092 |
| 29 | 464595690 |
| 30 | 921868388 |
| 31 | 1836393687 |
| 32 | 3672648928 |
| 33 | 7369572624 |
| 34 | 14821243232 |