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A185631

Row sums of triangle A185628.

1, 4, 10, 32, 137, 766, 5382, 46022, 467206, 5519252, 74629263, 1139283601, 19411643752, 365595475542, 7548810986515, 169681672611815, 4126880020198630, 108026180912533227, 3029184083924476085, 90617948406514693702, 2881333799993441893564, 97057552263114611503090

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OFFSET

0,2

COMMENTS

Triangle A185628 equals the matrix cube of triangle R = A185620, which satisfies: R^3 - R^2 + I = R shifted left one column.

LINKS

Table of n, a(n) for n=0..21.

PROG

(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+1, B=A^3-A^2+A^0; A=matrix(m+1, m+1); for(i=1, m+1, for(j=1, i, if(i<2||j==i, A[i, j]=1, if(j==1, A[i, j]=1, A[i, j]=B[i-1, j-1]))))); return(sum(k=1, n+1, (A^3)[n+1, k]))}

CROSSREFS

Cf. A185620, A185628, A185629, A185630.

Sequence in context: A151746 A378858 A110145 * A174520 A179654 A162427

Adjacent sequences: A185628 A185629 A185630 * A185632 A185633 A185634

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Sep 07 2011

STATUS

approved

URL: https://oeis.org/A185631

⇱ A185631 - OEIS