A125796 - OEIS

A125796

Column 6 of table A125790; also equals row sums of matrix power A078121^6.

1, 7, 49, 455, 6321, 140231, 5174449, 326603719, 35994670257, 7036275790791, 2470183452677297, 1573137497080468423, 1832597507832323118257, 3932481446278522861786055, 15637033863127787477309461681, 115814953429924513361085880079303, 1604893891765170672173387008222303409

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OFFSET

0,2

COMMENTS

Triangle A078121 shifts left one column under matrix square and is related to partitions into powers of 2.

LINKS

Table of n, a(n) for n=0..16.

PROG

(PARI) a(n)=local(p=6, q=2, A=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i || j==1, B[i, j]=1, B[i, j]=(A^q)[i-1, j-1]); )); A=B); return(sum(c=0, n, (A^p)[n+1, c+1]))

CROSSREFS

Cf. A125790, A078121; columns: A002577, A125792, A125793, A125794, A125795; diagonals: A125797, A125798.

Sequence in context: A195514 A204211 A349117 * A135745 A080895 A047899

Adjacent sequences: A125793 A125794 A125795 * A125797 A125798 A125799

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 10 2006

STATUS

approved