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!)
A187704 Number of (n+1)X(n+1) 0..5 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal 0
170, 93476, 2904, 4225652, 12898 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A187705

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for 4X4

..3..2..0..0....0..0..1..0....2..2..4..0....1..1..0..0....2..2..4..0

..3..2..2..4....3..2..1..0....5..5..5..0....1..1..2..4....2..2..2..0

..5..2..2..2....2..2..1..2....0..2..2..2....3..1..2..3....0..2..2..2

..0..0..2..2....4..4..1..2....0..5..0..0....0..0..2..3....0..4..2..2

CROSSREFS

Sequence in context: A098244 A250957 A114048 * A263059 A243294 A015975

Adjacent sequences:  A187701 A187702 A187703 * A187705 A187706 A187707

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 June 25 09:38 EDT 2022. Contains 354835 sequences. (Running on oeis4.)