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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 34 |
| 5 | 145 |
| 6 | 522 |
| 7 | 1518 |
| 8 | 4041 |
| 9 | 9150 |
| 10 | 19970 |
| 11 | 38555 |
| 12 | 74370 |
| 13 | 128040 |
| 14 | 224434 |
| 15 | 358988 |
| 16 | 587014 |
| 17 | 876114 |
| 18 | 1372578 |
| 19 | 1941624 |
| 20 | 2912816 |
| 21 | 4001868 |
| 22 | 5742391 |
| 23 | 7599933 |
| 24 | 10831065 |
| 25 | 13788935 |
| 26 | 18946564 |
| 27 | 24080514 |
| 28 | 32270596 |
| 29 | 39619720 |
| 30 | 53256875 |
| 31 | 63655605 |
| 32 | 83580675 |