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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 36 |
| 6 | 110 |
| 7 | 277 |
| 8 | 823 |
| 9 | 2292 |
| 10 | 6862 |
| 11 | 19518 |
| 12 | 57932 |
| 13 | 167852 |
| 14 | 499181 |
| 15 | 1464997 |
| 16 | 4360738 |
| 17 | 12891144 |
| 18 | 38436616 |
| 19 | 114235572 |
| 20 | 341264028 |
| 21 | 1018047671 |
| 22 | 3046747775 |
| 23 | 9114371288 |
| 24 | 27322966348 |
| 25 | 81915150788 |
| 26 | 245937559472 |
| 27 | 738620368466 |