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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 27 |
| 7 | 75 |
| 8 | 202 |
| 9 | 565 |
| 10 | 1602 |
| 11 | 4617 |
| 12 | 13472 |
| 13 | 39781 |
| 14 | 118604 |
| 15 | 356605 |
| 16 | 1080178 |
| 17 | 3293109 |
| 18 | 10097356 |
| 19 | 31118507 |
| 20 | 96341035 |