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A177788 binomial(n^2,n+1)/(n-1). 0
4, 63, 1456, 44275, 1669536, 75163011, 3934369216, 234799050915, 15736644960400, 1170354134607658, 95648578915114512, 8520904136405458044, 821828481957792579648, 85317719822978885714475 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

The entries are integer for n >= 2 because binomial(n^2,n+1)/(n-1) = n*binomial(n^2-2,n-1), which is a product of two integers.

LINKS

Table of n, a(n) for n=2..15.

FORMULA

a(n) = binomial(n^2,n+1)/(n-1) = n * A177234(n) = n^2 * A177784(n).

MAPLE

n0:=30: T:=array(1..n0): T:=array(1..n0-1): for n from 2 to n0 do: T[n-1]:= (binomial(n^2, n+1))/(n-1): od: print(T):

CROSSREFS

Cf. A177234, A177784, A000108, A060545

Sequence in context: A224249 A335112 A227619 * A293860 A299428 A274392

Adjacent sequences:  A177785 A177786 A177787 * A177789 A177790 A177791

KEYWORD

nonn

AUTHOR

Michel Lagneau, May 13 2010

EXTENSIONS

Removed redundant second Maple version - R. J. Mathar, May 14 2010

STATUS

approved

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Last modified May 14 07:13 EDT 2021. Contains 343879 sequences. (Running on oeis4.)