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Replies: 2   Last Post: Dec 23, 2009 4:59 PM

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 S L Posts: 61 Registered: 6/24/06
Posted: Dec 23, 2009 4:59 PM
 att1.html (1.6 K)

Tan hermosa solucion amigo Ignacio. Amigos ahora solo falta el problema 2

Una manito. Gracias nuevamente de antemano.

> From: ilarrosa@mundo-r.com
> To: snark@ccc.uba.ar
> Date: Wed, 23 Dec 2009 21:36:03 +0100
> Subject: Re: [Snark] CuadrilaterosLocos (01)
>
> Definiendo:
>
> Tri(n) = n(n + 1)/2, si n > 0
> Tri(n) = 0, si n <= 0
>
> f(n) = Sum(Sum(Tri(n - (k + m - 2)), m, 1, n), k, 1, n) = n(n + 1)(n + 2)(n
> + 3)/24 = Comb(n+3, 4)
>
> Para n = 1..20, f(n) es
>
> 1, 5, 15, 35, 70, 126, 210, 330, 495, 715, 1001, 1365, 1820, 2380, 3060,
> 3876, 4845, 5985, 7315, 8855
>
> http://www.research.att.com/~njas/sequences/A000332
>
> Saludos,
>
> Ignacio Larrosa Cañestro
> A Coruña (España)
> ilarrosa@mundo-r.com
>
> _______________________________________
> Snark
> Más información en http://www.snarkianos.com
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>

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Date Subject Author
12/23/09 S L
12/23/09 Ignacio Larrosa Cañestro
12/23/09 S L