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 | 2 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 39 |
| 6 | 107 |
| 7 | 289 |
| 8 | 772 |
| 9 | 2047 |
| 10 | 5402 |
| 11 | 14213 |
| 12 | 37325 |
| 13 | 97905 |
| 14 | 256622 |
| 15 | 672337 |
| 16 | 1760998 |
| 17 | 4611643 |
| 18 | 12075527 |
| 19 | 31617521 |
| 20 | 82781216 |
| 21 | 216732891 |
| 22 | 567428402 |
| 23 | 1485570025 |
| 24 | 3889310329 |
| 25 | 10182407329 |
| 26 | 26657986682 |
| 27 | 69791674109 |
| 28 | 182717232062 |
| 29 | 478360339887 |