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 | 3 |
| 4 | 5 |
| 5 | 12 |
| 6 | 24 |
| 7 | 58 |
| 8 | 126 |
| 9 | 300 |
| 10 | 686 |
| 11 | 1630 |
| 12 | 3792 |
| 13 | 8983 |
| 14 | 21051 |
| 15 | 49776 |
| 16 | 116858 |
| 17 | 275789 |
| 18 | 647573 |
| 19 | 1525847 |
| 20 | 3580673 |
| 21 | 8424978 |
| 22 | 19755938 |
| 23 | 46426810 |