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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 16 |
| 6 | 42 |
| 7 | 114 |
| 8 | 322 |
| 9 | 918 |
| 10 | 2673 |
| 11 | 7875 |
| 12 | 23457 |
| 13 | 70551 |
| 14 | 213846 |
| 15 | 652794 |
| 16 | 2004864 |
| 17 | 6190612 |
| 18 | 19207416 |
| 19 | 59850384 |
| 20 | 187217679 |
| 21 | 587689947 |
| 22 | 1850692506 |
| 23 | 5845013538 |
| 24 | 18509607753 |
| 25 | 58759391013 |
| 26 | 186958014766 |
| 27 | 596108115402 |
| 28 | 1904387243796 |
| 29 | 6095040222192 |
| 30 | 19540540075824 |