A125799 - OEIS

A125799

Antidiagonal sums of table A125790.

1, 2, 4, 9, 25, 94, 520, 4521, 64793, 1581010, 67106004, 5029631745, 673439168257, 162631617757086, 71416302988324776, 57430160224301687377, 85096038984339418975505, 233592305902515392375925762, 1193627868786115606927913952196, 11402285904243733254203516140245465

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OFFSET

0,2

COMMENTS

Table A125790 is related to partitions into powers of 2, with A002577 in column 1 of A125790; further, column k of A125790 equals row sums of matrix power A078121^k, where triangle A078121 shifts left one column under matrix square.

LINKS

Table of n, a(n) for n=0..19.

PROG

(PARI) a(n)=local(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^(c+1))[n-c+1, 1]))

CROSSREFS

Cf. A125790, A078121; columns: A002577, A125792, A125793, A125794, A125795, A125796; diagonals: A125797, A125798.

Sequence in context: A173311 A127055 A124835 * A220880 A307317 A188669

Adjacent sequences: A125796 A125797 A125798 * A125800 A125801 A125802

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 10 2006

STATUS

approved