A232653 Number of (n+2)X(7+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..7+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero

1, 1, 55, 55, 1, 571, 27453, 70897, 66043, 304485

Offset

1,3

Comments

Column 7 of A232654

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..0..1..0..1..0..0..1..1..1....0..0..1..1..0..0..0..1..0
..1..1..1..1..1..1..0..0..1....0..1..0..0..0..1..1..0..0
..1..0..1..0..1..1..1..1..0....1..0..0..0..1..0..0..0..1
..1..0..1..0..1..1..1..1..0....1..0..0..0..1..0..0..0..1
..1..1..1..1..1..1..0..0..1....0..1..0..0..0..1..1..0..0
..0..1..0..1..0..0..1..1..1....0..0..1..1..0..0..0..1..0

Crossrefs

Sequence in context: A236416 A214042 A112892 * A291502 A042511 A020282

Adjacent sequences: A232650 A232651 A232652 * A232654 A232655 A232656

Keyword

nonn

Author

R. H. Hardin, Nov 27 2013

Status

approved