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A187670
T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal
4
6, 50, 24, 192, 550, 112, 512, 4044, 11282, 974, 1126, 17716, 174292, 612204, 9928, 2146, 56080, 1549398, 36461174, 65533922, 197152, 3760, 150166, 6839146, 835707780
OFFSET
1,1
COMMENTS
Table starts
......6.......50......192.......512....1126...2146.3760
.....24......550.....4044.....17716...56080.150166
....112....11282...174292...1549398.6839146
....974...612204.36461174.835707780
...9928.65533922
.197152
EXAMPLE
Some k=3 solutions for 5X5
..0..2..2..0..3....0..2..2..2..3....0..2..2..2..1....0..2..2..2..3
..2..1..0..1..0....2..2..0..1..1....2..2..0..1..1....2..2..0..1..1
..2..0..3..0..2....2..0..2..0..2....2..0..1..1..3....2..0..1..0..2
..0..1..0..1..2....0..1..0..2..2....3..1..0..2..2....0..1..0..2..3
..3..2..2..2..0....1..1..2..3..1....2..1..2..2..0....1..1..2..2..1
CROSSREFS
Row 1 is A062801
Sequence in context: A187528 A187699 A212232 * A187462 A231270 A062801
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved