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A123329 Let M be the matrix defined in A111490. Sequence gives M(2,1)-M(1,2), M(2,1)+M(3,1)+M(3,2)-M(1,2)-M(1,3)-M(2,3), etc. 0
0, 1, 3, 8, 14, 26, 39, 59, 83, 115, 148, 197, 247, 307 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

FORMULA

a(n) = Sum_{i=1..(n-1)} M(i+1,i)-M(i,i+1).

a(n) = binomial(n+2,3) - A070248(n+1). - Robert Israel, Aug 13 2015

CROSSREFS

Sequence in context: A055335 A295200 A321047 * A268191 A169929 A129067

Adjacent sequences:  A123326 A123327 A123328 * A123330 A123331 A123332

KEYWORD

easy,nonn

AUTHOR

Paolo P. Lava and Giorgio Balzarotti, Oct 06 2006

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)