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A125793 Column 3 of table A125790; also equals row sums of matrix power A078121^3. 8
1, 4, 16, 84, 656, 8148, 167568, 5866452, 356855440, 38315189204, 7352635371152, 2547660633170900, 1607532367023451792, 1860491404939092059092, 3974085151281967171382928, 15751822048486986712162264020 (list; graph; refs; listen; history; text; internal format)
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..15.

PROG

(PARI) a(n)=local(p=3, 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, A125794, A125795, A125796; diagonals: A125797, A125798.

Sequence in context: A134006 A090013 A333370 * A121145 A144882 A298012

Adjacent sequences:  A125790 A125791 A125792 * A125794 A125795 A125796

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 10 2006

STATUS

approved

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)