id:A123326 - OEIS Search Results

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Let M be the matrix defined in A111490. Sequence gives the sum of the elements of the sub-matrices (from the upper left element): M(1,1); M(1,1)+M(1,2)+M(1,2)+M(2,2); M(1,1)+M(1,2)+M(1,3)+M(2,1)+M(2,2)+M(2,3)+M(3,1)+M(3,2)+M(3,3),etc.

+0
2

1, 5, 13, 27, 47, 77, 114, 165, 226, 302, 391, 502, 622, 768, 933, 1120, 1325, 1564, 1819, 2112, 2424 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)= Sum_{i=1..n}[Sum_{j=1..n} M(i,j)] a(n)= a(n-1)+ A121896 with a(0)=0`
	EXAMPLE	`a(4)=1+1+1+1 + 1+2+1+2 +1+2+3+1 +1+2+3+4 = 27`
	CROSSREFS	`Cf. A111490.` `Sequence in context: A008778 A014813 A008580 this_sequence A025193 A002717 A023541` `Adjacent sequences: A123323 A123324 A123325 this_sequence A123327 A123328 A123329`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paolo P. Lava and Giorgio Balzarotti (ppl(AT)spl.at), Sep 26 2006`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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