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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
OFFSET
2,2
LINKS
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 * A377017 A224429 A289325
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Aug 18 2012
STATUS
approved