A182289 - OEIS

%I #34 Aug 28 2012 15:55:59

%S 1,3,2,5,5,3,7,7,7,6,2,4,9,9,9,9,9,8,3,5,11,11,11,11,11,11,11,10,6,2,

%T 10,4,9,3,6,13,13,13,13,13,13,13,13,13,13,13,12,8,3,12,5,11,4,7,15,15,

%U 15,15,15,15,15,15,15,15,15,15,15,15,15,14,10,6

%N Triangle read by rows. Let p be one of the parts of size A135010(n,k) in one of the partitions of n and S(n,k) = sum of all preceding parts to p in the mentioned partition of n. So T(n,k) = 2*S(n,k) + A135010(n,k).

%C Consider a physical model of the partitions of n in which each part p of size A135010(n,j) is represented by a right circular cylinder with radius j and height 2. T(n,k) is also the distance (or coordinate X) from the axis Y to the center of the base of cylinder of the part p in the structure of A135010.

%e Written as an irregular triangle the sequence begins:

%e 1;

%e 3,2;

%e 5,5,3;

%e 7,7,7,6,2,4;

%e 9,9,9,9,9,8,3,5;

%e 11,11,11,11,11,11,11,10,6,2,10,4,9,3,6;

%e 13,13,13,13,13,13,13,13,13,13,13,12,8,3,12,5,11,4,7;

%e 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,14,10,6,2,14,10,4,14,9,3,14,6,13,5,10,4,8;

%Y Row n starts with A000041(n-1) terms equal to A005408(n-1). Row n has length A138137(n). Right border gives A000027.

%Y Cf. A135010.

%K nonn,tabf

%O 1,2

%A _Omar E. Pol_, Aug 14 2012