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 | 125 |
| 6 | 28930 |
| 7 | 809368 |
| 8 | 9414152 |
| 9 | 66305781 |
| 10 | 338374560 |
| 11 | 1378426060 |
| 12 | 4751038284 |
| 13 | 14388638901 |
| 14 | 39296604844 |
| 15 | 98605016040 |
| 16 | 230507248912 |
| 17 | 507379370525 |
| 18 | 1060395103800 |
| 19 | 2118303772332 |
| 20 | 4066797540820 |
| 21 | 7537144196589 |
| 22 | 13535598398916 |
| 23 | 23628635128024 |
| 24 | 40203393674520 |