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 | 3 |
| 2 | 7 |
| 3 | 14 |
| 4 | 26 |
| 5 | 47 |
| 6 | 85 |
| 7 | 156 |
| 8 | 292 |
| 9 | 557 |
| 10 | 1079 |
| 11 | 2114 |
| 12 | 4174 |
| 13 | 8283 |
| 14 | 16489 |
| 15 | 32888 |
| 16 | 65672 |
| 17 | 131225 |
| 18 | 262315 |
| 19 | 524478 |
| 20 | 1048786 |
| 21 | 2097383 |
| 22 | 4194557 |
| 23 | 8388884 |
| 24 | 16777516 |
| 25 | 33554757 |
| 26 | 67109215 |
| 27 | 134218106 |
| 28 | 268435862 |
| 29 | 536871347 |
| 30 | 1073742289 |
| 31 | 2147484144 |