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A236273
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Number of (n+1)X(3+1) 0..2 arrays with the upper median unequal to the lower median in every 2X2 subblock
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1
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1048, 15434, 232736, 3604782, 56299040, 884625654, 13930389246, 219666732130, 3465756760168, 54697571104400, 863364488755858, 13628610245730708, 215140611062094002, 3396256121150879282, 53614426723942801722
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OFFSET
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1,1
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COMMENTS
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Column 3 of A236278
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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) = 23*a(n-1) -16*a(n-2) -2232*a(n-3) +7199*a(n-4) +81562*a(n-5) -305840*a(n-6) -1579897*a(n-7) +5702786*a(n-8) +18527773*a(n-9) -56010227*a(n-10) -138644483*a(n-11) +297115491*a(n-12) +656260628*a(n-13) -774956030*a(n-14) -1816063888*a(n-15) +616468708*a(n-16) +2397532500*a(n-17) +617130944*a(n-18) -763319696*a(n-19) -368062992*a(n-20) +11133168*a(n-21) +22287808*a(n-22) +1286144*a(n-23) -327168*a(n-24) -26624*a(n-25)
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EXAMPLE
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Some solutions for n=2
..2..0..0..2....0..1..0..2....0..2..1..0....1..0..0..0....1..0..0..1
..1..2..1..2....2..0..2..1....1..2..0..2....2..2..2..1....0..2..2..0
..0..0..2..0....0..1..0..2....0..0..2..1....1..1..1..2....0..1..1..2
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CROSSREFS
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Sequence in context: A056092 A280809 A252307 * A251375 A281033 A337960
Adjacent sequences: A236270 A236271 A236272 * A236274 A236275 A236276
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 21 2014
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STATUS
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approved
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