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) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 49 |
| 9 | 273 |
| 10 | 1506 |
| 11 | 7788 |
| 12 | 40161 |
| 13 | 202917 |
| 14 | 1028170 |
| 15 | 5190328 |
| 16 | 26375635 |
| 17 | 134565795 |
| 18 | 692890250 |
| 19 | 3596739368 |
| 20 | 18877483060 |
| 21 | 100131220940 |
| 22 | 537718999715 |
| 23 | 2922918175965 |
| 24 | 16100254700137 |
| 25 | 89857257410905 |
| 26 | 508473405642250 |
| 27 | 2916903963927300 |
| 28 | 16969580464205400 |