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A235315
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Number of (n+1)X(4+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings)
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1
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3920, 8392, 16352, 40144, 89600, 241600, 598976, 1723456, 4616960, 13917952, 39447872, 123109504, 363776000, 1165742080, 3555169856, 11629123456, 36344940800, 120802796032, 384900713792, 1295327764864, 4190699379200
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OFFSET
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1,1
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COMMENTS
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Column 4 of A235319
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 4*a(n-1) +47*a(n-2) -200*a(n-3) -901*a(n-4) +4204*a(n-5) +8957*a(n-6) -48440*a(n-7) -47194*a(n-8) +334096*a(n-9) +101948*a(n-10) -1410080*a(n-11) +170136*a(n-12) +3549696*a(n-13) -1446912*a(n-14) -4861440*a(n-15) +2954880*a(n-16) +2764800*a(n-17) -2073600*a(n-18)
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EXAMPLE
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Some solutions for n=4
..2..3..1..5..1....1..6..0..4..1....1..6..2..5..3....1..5..3..4..2
..6..0..5..2..5....6..4..5..2..6....4..2..5..1..6....4..1..6..0..5
..3..4..2..6..2....1..6..0..4..1....1..6..2..5..3....2..6..4..5..3
..6..0..5..2..5....6..4..5..2..6....3..1..4..0..5....4..1..6..0..5
..2..3..1..5..1....1..6..0..4..1....1..6..2..5..3....1..5..3..4..2
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CROSSREFS
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Sequence in context: A209732 A221239 A136459 * A229642 A266060 A034283
Adjacent sequences: A235312 A235313 A235314 * A235316 A235317 A235318
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 05 2014
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STATUS
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approved
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