A203372 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

12, 164, 5208, 387324, 67731264, 27913330472, 27149753088792, 62383316832685348, 338853014329060508760, 4353185098169744392741448, 132316928041105714306034574480, 9518293354852895518368238072987352

Offset

1,1

Comments

Diagonal of A203378

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A282010 A143583 A231541 * A193104 A046174 A055760

Adjacent sequences: A203369 A203370 A203371 * A203373 A203374 A203375

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved