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0, 1, 8, 36, 167, 693, 2849, 11459, 46244, 185622, 743759, 2974937, 11907026, 47643438, 190606963, 762449101, 3049917900, 12199777048, 48799551822, 195198666492, 780796575104, 3123189865122, 12492766610068, 49971069327602, 199884317492186, 799537344955292
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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PROG
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(Python)
from math import isqrt
def A055064(n): return ((m:=1<<n)<<n)+((s:=isqrt(m))**2*(s+1)-sum((q:=m//k)*((k<<1)+q+1) for k in range(1, s+1))>>1) # Chai Wah Wu, Oct 22 2023
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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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