A232649 Number of (n+2)X(3+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..3+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, 1, 3571, 8881, 1, 55765, 142369, 1, 947947, 2468845, 1, 17099809, 45375499, 1, 323927185, 871038571, 1, 6369199909, 17312303761, 1, 129094833121, 354018140455, 1, 2682854657047, 7411871621617, 1

Offset

1,3

Comments

Column 3 of A232654

Links

R. H. Hardin, Table of n, a(n) for n = 1..44

Example

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

Crossrefs

Sequence in context: A011452 A199952 A093781 * A232650 A365672 A108390

Adjacent sequences: A232646 A232647 A232648 * A232650 A232651 A232652

Keyword

nonn

Author

R. H. Hardin, Nov 27 2013

Status

approved