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 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 23 |
| 5 | 46 |
| 6 | 103 |
| 7 | 206 |
| 8 | 455 |
| 9 | 910 |
| 10 | 1993 |
| 11 | 3986 |
| 12 | 8679 |
| 13 | 17358 |
| 14 | 37633 |
| 15 | 75266 |
| 16 | 162643 |
| 17 | 325286 |
| 18 | 701075 |
| 19 | 1402150 |
| 20 | 3015563 |
| 21 | 6031126 |
| 22 | 12948083 |
| 23 | 25896166 |
| 24 | 55513327 |
| 25 | 111026654 |
| 26 | 237705547 |
| 27 | 475411094 |
| 28 | 1016736115 |
| 29 | 2033472230 |