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 A108959 Triangle arising in connection with deformations of type D Kleinian singularities. 0

%I

%S 1,2,1,3,4,2,4,10,14,7,5,20,54,76,38,6,35,154,419,590,295,7,56,364,

%T 1616,4400,6196,3098,8,84,756,4962,22048,60036,84542,42271,9,120

%N Triangle arising in connection with deformations of type D Kleinian singularities.

%D P. Boddington, Ph.D. thesis, University of Warwick, 2005.

%F For k>=0 define p_k(x)=x(x+1)(x+3)...(x+k(k-1)/2) and consider the linear map taking each p_k(x) to kp_k(x)/x. Then the images of x, x^2, x^3, ... are given by the rows. Eg x^3 goes to 3x^2+4x+2.

%Y This sequence is an improved version of A097418. Coefficients of 1 give A000366.

%K easy,nonn,tabl

%O 0,2

%A _Paul Boddington_, Jul 22 2005

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Last modified May 19 12:49 EDT 2019. Contains 323393 sequences. (Running on oeis4.)