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A105595 Row sums of number triangle A105594. 4
1, 1, 3, 1, 3, 3, 3, 1, 3, 3, 3, 3, 3, 7, 3, 9, 1, 3, 3, 5, 5, 7, 9, 3, 3, 7, 9, 15, 7, 13, 21, 13, 1, 1, 5, 1, 3, 5, 7, 11, 3, 3, 7, 13, 5, 11, 13, 19, 3, 7, 7, 7, 7, 19, 9, 25, 7, 13, 21, 23, 15, 27, 19, 39, 1, 1, 3, 1, 5, 5, 3, 9, 3, 5, 11, 9, 9, 13, 19, 21, 3, 7, 7, 9, 7, 15, 17, 19, 7, 15, 21 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Conjecture : all terms are odd.
LINKS
FORMULA
a(n)=sum{k=0..n, mod(sum{j=0..n, abs(mu(binomial(n, j)))*mod(binomial(j, k), 2)}, 2)}
MAPLE
A105595 := proc(n)
add(A105594(n, k), k=0..n) ;
end proc: # R. J. Mathar, Nov 28 2014
CROSSREFS
Cf. A105596.
Sequence in context: A059787 A081325 A132680 * A072219 A173854 A059789
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 14 2005
STATUS
approved

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Last modified June 23 07:33 EDT 2024. Contains 373629 sequences. (Running on oeis4.)