The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A187700

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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
(history; published version)

#4 by Russ Cox at Sat Mar 31 12:36:09 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Mar 12 2011

Discussion

Sat Mar 31

12:36

OEIS Server: https://oeis.org/edit/global/875

#3 by Ron Hardin at Sat Mar 12 18:27:12 EST 2011

STATUS

proposed

approved

#2 by Ron Hardin at Sat Mar 12 18:27:09 EST 2011

NAME

allocated for Ron HardinNumber of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection

DATA

104, 7954, 87258, 692410, 2363474, 10839282, 23999702, 69386216, 148926738

OFFSET

1,1

COMMENTS

Row 3 of A187699

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

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Mar 12 2011

STATUS

approved

proposed

#1 by Ron Hardin at Sat Mar 12 18:22:22 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved