A232650 Number of (n+2)X(4+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..4+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero

1, 1, 7, 7, 1, 19, 55, 1, 259, 613, 2761, 7615, 8881, 1, 55765, 142369, 1, 7276903, 27224617, 1, 17099809, 45375499

Offset

1,3

Comments

Column 4 of A232654

Links

Table of n, a(n) for n=1..22.

Example

Some solutions for n=6
..0..1..0..0..1..0....0..0..1..1..0..0....0..1..1..1..1..0....0..1..0..0..1..0
..0..1..0..0..1..0....0..1..0..0..1..0....1..1..0..0..1..1....0..1..0..0..1..0
..0..1..0..0..1..0....0..1..0..0..1..0....0..1..1..1..1..0....0..1..0..0..1..0
..0..0..1..1..0..0....1..0..0..0..0..1....1..1..0..0..1..1....1..0..0..0..0..1
..1..0..0..0..0..1....0..0..1..1..0..0....1..0..1..1..0..1....0..0..1..1..0..0
..0..1..0..0..1..0....0..0..1..1..0..0....1..1..0..0..1..1....0..1..0..0..1..0
..1..0..0..0..0..1....0..1..0..0..1..0....1..0..1..1..0..1....0..0..1..1..0..0
..0..0..1..1..0..0....1..0..0..0..0..1....0..1..1..1..1..0....1..0..0..0..0..1

Crossrefs

Sequence in context: A199952 A093781 A232649 * A365672 A108390 A102400

Adjacent sequences: A232647 A232648 A232649 * A232651 A232652 A232653

Keyword

nonn

Author

R. H. Hardin, Nov 27 2013

Status

approved