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 | 5 |
| 3 | 10 |
| 4 | 19 |
| 5 | 37 |
| 6 | 72 |
| 7 | 141 |
| 8 | 277 |
| 9 | 546 |
| 10 | 1079 |
| 11 | 2137 |
| 12 | 4240 |
| 13 | 8425 |
| 14 | 16761 |
| 15 | 33378 |
| 16 | 66523 |
| 17 | 132669 |
| 18 | 264728 |
| 19 | 528469 |
| 20 | 1055341 |
| 21 | 2108098 |
| 22 | 4212015 |
| 23 | 8417265 |
| 24 | 16823584 |
| 25 | 33629457 |
| 26 | 67230257 |
| 27 | 134414146 |
| 28 | 268753267 |
| 29 | 537385141 |
| 30 | 1074573864 |
| 31 | 2148829917 |