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1, 1, 63, 21120, 20585565, 44025570225, 175418438510700, 1169944052730453000, 12110024900113702687125, 183906442861089163922581875, 3923248989041777334572795737575, 113570018319217734510803494872644700, 4337118170117525113961286942555563803500
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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PROG
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(SageMath)
@cached_function
def P(m, n):
x = polygen(ZZ)
if n == 0: return x^0
return expand(sum(binomial(m*n, m*k)*P(m, n-k)*x for k in (1..n)))
def A327416(n): return P(2, 2*n).list()[n]//factorial(n)
print([A327416(n) for n in range(13)])
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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