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 A187699 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection 4
 6, 50, 0, 192, 8, 104, 512, 74, 7954, 0, 1126, 280, 87258, 1548, 9350, 2146, 784, 692410, 22738, 15128848, 0, 3760, 1970, 2363474, 320674, 1089964504, 454640, 4280018, 6112, 3580, 10839282, 1147854 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .......6.......50........192....512....1126.....2146.3760.6112 .......0........8.........74....280.....784.....1970.3580 .....104.....7954......87258.692410.2363474.10839282 .......0.....1548......22738.320674.1147854 ....9350.15128848.1089964504 .......0...454640 .4280018 LINKS EXAMPLE Some k=3 solutions for 5X5 ..1..0..1..1..2....3..2..3..1..0....2..1..3..2..3....1..2..3..1..2 ..0..1..1..0..1....3..3..3..0..3....1..2..3..1..3....2..1..3..2..1 ..1..1..2..1..2....2..1..2..1..1....2..1..3..2..3....1..2..3..1..2 ..1..0..1..1..1....3..0..3..3..0....3..0..3..3..3....0..3..3..0..3 ..3..1..2..1..2....3..1..3..2..1....3..1..2..1..2....1..2..3..1..2 CROSSREFS Row 1 is A062801 Row 2 is A187529 Sequence in context: A305376 A024268 A187528 * A212232 A187670 A187462 Adjacent sequences:  A187696 A187697 A187698 * A187700 A187701 A187702 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 12 2011 STATUS approved

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Last modified August 11 00:55 EDT 2022. Contains 356046 sequences. (Running on oeis4.)