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A186245 C(n^2, 2*n). 0

%I

%S 1,84,12870,3268760,1251677700,675248872536,488526937079580,

%T 456703981505085600,535983370403809682970,771629762387959506903300,

%U 1337261858854117218288723600,2746379593275133584459064976784,6596095888094645606758451183394760

%N C(n^2, 2*n).

%o (Python)

%o import math

%o for n in range(2,22):

%o x = n*n

%o y = n+n

%o print math.factorial(x) / (math.factorial(x-y) * math.factorial(y)),

%Y Cf. A014062.

%K nonn

%O 2,2

%A _Alex Ratushnyak_, Aug 18 2012

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Last modified July 11 21:30 EDT 2020. Contains 335652 sequences. (Running on oeis4.)