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A228258
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Number of third differences of arrays of length n+3 of numbers in 0..6
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1
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49, 1267, 22727, 310425, 3298681, 28791007, 218845881, 1609259287, 11658284065, 83824687591, 599858908753, 4277376525367, 30411820662145, 215703854542471, 1526853641242033, 10789535445362647, 76136107857549025, 536608913442906151
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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) = 13*a(n-1) -42*a(n-2) for n>12
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EXAMPLE
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Some solutions for n=4
.-4...-7...-4...-7...-4..-18..-10..-11..-14...-9...-6...-8..-13...-9..-12...-8
-10....0...-6....5..-10...18...-1...11....5....4...-2...18....5...18...22...-1
.16....2....2...-5...19...-3....7...-7...-4...10....0..-22....7..-18..-20....9
-14...-2....7....3..-16..-10...-5....3....2..-16...10...21..-10....5....7..-11
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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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