login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A187700 Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection 0
104, 7954, 87258, 692410, 2363474, 10839282, 23999702, 69386216, 148926738 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A187699

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some n=3 solutions for 4X4

..0..2..0..2....0..3..0..3....2..1..2..1....0..1..0..1....0..1..3..2

..3..1..3..0....1..0..1..3....2..3..2..3....1..3..1..3....2..0..1..0

..0..2..0..2....0..1..0..1....3..1..3..1....1..2..1..2....0..1..0..2

..3..2..3..0....3..0..3..2....2..2..2..2....1..1..1..1....2..2..1..2

CROSSREFS

Sequence in context: A286329 A164759 A206013 * A015272 A048920 A091539

Adjacent sequences:  A187697 A187698 A187699 * A187701 A187702 A187703

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 19 09:57 EST 2020. Contains 332041 sequences. (Running on oeis4.)