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 | 6 |
| 5 | 17 |
| 6 | 57 |
| 7 | 196 |
| 8 | 723 |
| 9 | 2729 |
| 10 | 10638 |
| 11 | 42161 |
| 12 | 169912 |
| 13 | 692703 |
| 14 | 2853523 |
| 15 | 11852644 |
| 16 | 49592966 |
| 17 | 208800209 |
| 18 | 883970867 |
| 19 | 3760605627 |
| 20 | 16068272965 |
| 21 | 68925340187 |
| 22 | 296705390322 |
| 23 | 1281351319402 |
| 24 | 5549911448062 |
| 25 | 24103086681839 |
| 26 | 104938476264310 |
| 27 | 457920147387969 |
| 28 | 2002462084788769 |