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 | 6 |
| 3 | 26 |
| 4 | 101 |
| 5 | 366 |
| 6 | 1294 |
| 7 | 4400 |
| 8 | 14706 |
| 9 | 48362 |
| 10 | 157583 |
| 11 | 507714 |
| 12 | 1621211 |
| 13 | 5138804 |
| 14 | 16204008 |
| 15 | 50867068 |
| 16 | 159004142 |
| 17 | 494928072 |
| 18 | 1534638702 |
| 19 | 4743180908 |
| 20 | 14622202326 |
| 21 | 44978845086 |
| 22 | 138074363360 |
| 23 | 422979847404 |
| 24 | 1293101281551 |
| 25 | 3945553307665 |
| 26 | 12018461150832 |
| 27 | 36556888102402 |