login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A187672 Number of 4X4 0..n arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal 0
112, 11282, 174292, 1549398, 6839146, 32368980, 88344978, 268011840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A187670

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some n=3 solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A203788 A180027 A240229 * A049217 A206310 A331670

Adjacent sequences:  A187669 A187670 A187671 * A187673 A187674 A187675

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 6 15:57 EDT 2022. Contains 355111 sequences. (Running on oeis4.)