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 A226717 T(n,k)=Number of nXk (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(k+1) binary array 9
 3, 9, 9, 25, 71, 25, 67, 427, 427, 67, 181, 2393, 4671, 2393, 181, 491, 13691, 49019, 49019, 13691, 491, 1331, 80043, 539703, 977939, 539703, 80043, 1331, 3607, 469273, 6045209, 20577215, 20577215, 6045209, 469273, 3607, 9775, 2739433, 67402167 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ....3........9.........25............67..............181.................491 ....9.......71........427..........2393............13691...............80043 ...25......427.......4671.........49019...........539703.............6045209 ...67.....2393......49019........977939.........20577215...........439030021 ..181....13691.....539703......20577215........833949273.........34404755041 ..491....80043....6045209.....439030021......34404755041.......2753775365011 .1331...469273...67402167....9326184515....1412775737517.....219013376708219 .3607..2739433..748987305..197633166633...57827217804729...17350805966693235 .9775.15958607.8323819069.4188392176965.2366890987279579.1374728293480549343 LINKS R. H. Hardin, Table of n, a(n) for n = 1..112 FORMULA Empirical for column k: k=1: a(n) = 2*a(n-1) +a(n-2) +2*a(n-3) +a(n-4) +a(n-5) k=2: [order 16] k=3: [order 42] EXAMPLE Some solutions for n=3 k=4 ..0.-1..1.-1....0..0..0..0....1.-1.-1..1....0..1..1.-1....1..1..0..0 ..0..0..0.-1....0..1.-1..0....0..1..1.-1....0..0..0..0...-1..0..0..0 ..0.-1..1..1...-1.-1..1..1....0.-1..1..0....0.-1..1..0...-1..1..0..1 CROSSREFS Sequence in context: A268971 A267966 A263320 * A207208 A206734 A207358 Adjacent sequences:  A226714 A226715 A226716 * A226718 A226719 A226720 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jun 15 2013 STATUS approved

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Last modified January 18 11:57 EST 2022. Contains 350455 sequences. (Running on oeis4.)