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 | 4 |
| 4 | 55 |
| 5 | 154 |
| 6 | 1885 |
| 7 | 5248 |
| 8 | 64051 |
| 9 | 178294 |
| 10 | 2175865 |
| 11 | 6056764 |
| 12 | 73915375 |
| 13 | 205751698 |
| 14 | 2510946901 |
| 15 | 6989500984 |
| 16 | 85298279275 |
| 17 | 237437281774 |
| 18 | 2897630548465 |
| 19 | 8065878079348 |
| 20 | 98434140368551 |
| 21 | 274002417416074 |
| 22 | 3343863141982285 |
| 23 | 9308016314067184 |
| 24 | 113592912687029155 |