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# User:Jean-Bernard François

From OeisWiki

## $whoami?

I'm Jean-Bernard François (aka infofiltrage) born in France the 03/05/69 & DP Engineer (Engineering Graphics Software).

My current blog is Bondissant (almost art from geometry).

I love number theory, mathematics, and of course OEIS.

I only worked under Debian Linux System with LibreOffice, Inkscape and a LiberKey.

## Contributions

## Useful Links

## Others

Collatz | Diophantine | Primes | Number Theory

[talk]

## Sequence of the Day for August 14

A035287: Number of ways to place a non-attacking white and black rook onn × n |

- { 4, 36, 144, 400, 900, 1764, 3136, ... }

n 2 (n − 1) 2 = (n (n − 1)) 2 = {(n) 2} 2 |

(n) 2 |

n × n |

k |

n × n |

{(n)k } 2 |

{(n) 3} 2 = (n (n − 1) (n − 2)) 2 |

n × n × n |

k |

{(n)k } 3 |

See:

* `{{ (x)_n}}` (falling factorial function template)