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) |
|---|---|
| 10 | 1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 6 |
| 14 | 13 |
| 15 | 26 |
| 16 | 56 |
| 17 | 115 |
| 18 | 247 |
| 19 | 533 |
| 20 | 1175 |
| 21 | 2635 |
| 22 | 6037 |
| 23 | 14069 |
| 24 | 33378 |
| 25 | 80466 |
| 26 | 196759 |
| 27 | 487453 |
| 28 | 1221515 |
| 29 | 3092719 |
| 30 | 7901816 |
| 31 | 20354765 |
| 32 | 52815434 |
| 33 | 137946253 |
| 34 | 362430959 |
| 35 | 957359614 |
| 36 | 2541249138 |
| 37 | 6775848932 |
| 38 | 18141119582 |
| 39 | 48753971355 |
| 40 | 131485310625 |
| 41 | 355759469235 |