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A316661
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a(n) = ceiling(sqrt((2*n)^n)).
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1
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1, 2, 4, 15, 64, 317, 1728, 10268, 65536, 445376, 3200000, 24172677, 191102976, 1575167570, 13492928512, 119786923327, 1099511627776, 10412878353557, 101559956668416, 1018460448140641, 10485760000000000, 110692335104026964, 1196683881290399744
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OFFSET
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0,2
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COMMENTS
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a(0)=1 relies on the algebraic identity 0^0 = 1 (à la Knuth).
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LINKS
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MATHEMATICA
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Join[{1}, Table[Ceiling[Sqrt[(2 n)^n]], {n, 30}]] (* Vincenzo Librandi, Jul 10 2018 *)
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PROG
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(Python)
from math import isqrt
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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