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A118911 Row sums of triangle in A128973 . +0
1
1, 1, 3, 3, 3, 3, 5, 5, 3, 3, 9, 9, 5, 5, 11, 11, 3, 3, 9, 9, 9, 9, 15, 15, 5, 5, 15, 15, 11, 11, 21, 21, 3, 3, 9, 9, 9, 9, 15, 15, 9, 9, 27, 27, 15, 15, 33, 33, 9, 9, 27, 27, 27, 27, 45, 45, 15, 15, 45, 45, 33, 33, 63, 63, 5, 5, 15, 15, 15, 15, 25, 25, 15, 15, 45, 45, 25, 25, 55, 55, 11, 11 (list; graph; listen)
OFFSET

0,3

COMMENT

Integers in A071053 repeated .

FORMULA

a(2*n)=a(2*n+1) . a(n)=Sum_{k, 0<=k<=n}A128973(n,k) . a(2^k+m)=3*a(m) for 0<=m<=2^(k-1)-1, k>=1 .

a(4n)=a(2n)=A071053(n) .

CROSSREFS

Sequence in context: A068048 A056206 A125713 this_sequence A111756 A130821 A129756

Adjacent sequences: A118908 A118909 A118910 this_sequence A118912 A118913 A118914

KEYWORD

nonn

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), May 02 2007, Jan 06 2008

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.


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