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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 4 |
| 8 | 26 |
| 9 | 235 |
| 10 | 1585 |
| 11 | 10453 |
| 12 | 40151 |
| 13 | 199922 |
| 14 | 792867 |
| 15 | 3146993 |
| 16 | 12532362 |
| 17 | 49280874 |
| 18 | 189564720 |
| 19 | 739243108 |
| 20 | 2858545267 |
| 21 | 11101139486 |
| 22 | 43154849550 |
| 23 | 167993679964 |
| 24 | 654778791594 |
| 25 | 2556955750961 |