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A247529
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Number of length n+3 0..4 arrays with some disjoint pairs in every consecutive four terms having the same sum
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1
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185, 317, 561, 1007, 1823, 3455, 6495, 12105, 22459, 43255, 82157, 154279, 287847, 556213, 1059205, 1992823, 3723991, 7202379, 13726813, 25838725, 48308217, 93456427, 178172281, 335410643, 627185919, 1213463869, 2313820457, 4355601755
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = a(n-1) +4*a(n-2) -4*a(n-3) +18*a(n-4) -18*a(n-5) -78*a(n-6) +78*a(n-7) -67*a(n-8) +67*a(n-9) +386*a(n-10) -386*a(n-11) +22*a(n-12) -22*a(n-13) -686*a(n-14) +686*a(n-15) +125*a(n-16) -125*a(n-17) +616*a(n-18) -616*a(n-19) -178*a(n-20) +178*a(n-21) -340*a(n-22) +340*a(n-23) +130*a(n-24) -130*a(n-25) +80*a(n-26) -80*a(n-27) -40*a(n-28) +40*a(n-29) for n>30
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EXAMPLE
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Some solutions for n=6
..0....3....0....1....4....3....4....3....1....3....0....1....3....2....4....0
..1....4....4....2....1....2....2....4....0....2....3....0....0....4....1....0
..3....0....1....0....2....1....1....1....2....4....1....2....4....1....0....2
..4....1....3....1....3....2....3....0....3....1....2....1....1....3....3....2
..2....3....2....1....4....3....2....3....1....3....2....1....3....0....2....4
..1....4....2....2....1....4....2....2....2....0....3....2....2....2....1....0
..3....2....1....2....2....1....3....1....2....2....1....0....2....1....2....2
..2....3....1....1....3....0....1....2....3....1....0....3....3....1....3....2
..4....3....0....3....4....3....4....1....1....1....4....1....1....0....4....0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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