A232648 Number of (n+2)X(1+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..1+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero

2, 2, 1, 1, 5, 8, 1, 1, 36, 63, 1, 1, 362, 658, 1, 1, 4111, 7637, 1, 1, 49911, 93847, 1, 1, 632603, 1199893, 1, 1, 8273611, 15796440, 1, 1, 110826889, 212681977, 1, 1, 1512776591, 2915017361, 1, 1, 20965992018, 40536016031, 1, 1, 294245741168

Offset

1,1

Comments

Column 1 of A232654

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

All solutions for n=5
..0..0..1....0..0..1....0..0..1....0..0..1....0..0..0
..1..1..0....0..0..1....1..1..0....0..0..1....0..0..0
..0..0..1....1..1..0....1..1..0....1..1..0....0..0..0
..0..0..1....1..1..0....1..1..0....0..0..1....0..0..0
..1..1..0....0..0..1....1..1..0....1..1..0....0..0..0
..0..0..1....0..0..1....0..0..1....1..1..0....0..0..0
..1..1..0....1..1..0....0..0..1....0..0..1....0..0..0

Crossrefs

Sequence in context: A318405 A181645 A129104 * A295690 A219727 A177694

Adjacent sequences: A232645 A232646 A232647 * A232649 A232650 A232651

Keyword

nonn

Author

R. H. Hardin, Nov 27 2013

Status

approved