The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A187704 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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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
(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 18:56:13 EST 2011

STATUS

proposed

approved

#2 by Ron Hardin at Sat Mar 12 18:56:10 EST 2011

NAME

allocated for Ron HardinNumber 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

DATA

170, 93476, 2904, 4225652, 12898

OFFSET

1,1

COMMENTS

Column 5 of A187705

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

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 18:53:27 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved