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A186245 a(n) = binomial(n^2, 2*n). 1
1, 84, 12870, 3268760, 1251677700, 675248872536, 488526937079580, 456703981505085600, 535983370403809682970, 771629762387959506903300, 1337261858854117218288723600, 2746379593275133584459064976784, 6596095888094645606758451183394760 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Michael De Vlieger, Table of n, a(n) for n = 2..205

MATHEMATICA

Array[Binomial[#^2, 2 #] &, 13, 2] (* Michael De Vlieger, May 21 2021 *)

PROG

(Python)

import math

for n in range(2, 22):

    x = n*n

    y = n+n

    print(math.factorial(x) / (math.factorial(x-y) * math.factorial(y)), end=', ')

CROSSREFS

Cf. A014062.

Sequence in context: A283947 A265586 A278725 * A224429 A289325 A202923

Adjacent sequences:  A186242 A186243 A186244 * A186246 A186247 A186248

KEYWORD

nonn

AUTHOR

Alex Ratushnyak, Aug 18 2012

STATUS

approved

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Last modified January 23 23:01 EST 2022. Contains 350515 sequences. (Running on oeis4.)