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A167704
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a(0)=1, a(1)=0, a(2)=2, a(3)=1, a(n)=a(n-2)+a(n-3)+a(n-4) for n>3.
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2
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1, 0, 2, 1, 3, 3, 6, 7, 12, 16, 25, 35, 53, 76, 113, 164, 242, 353, 519, 759, 1114, 1631, 2392, 3504, 5137, 7527, 11033, 16168, 23697, 34728, 50898, 74593, 109323, 160219, 234814, 344135, 504356, 739168, 1083305, 1587659, 2326829, 3410132, 4997793, 7324620
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OFFSET
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0,3
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COMMENTS
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Diagonal sums of triangle in A122950.
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LINKS
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FORMULA
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G.f.: (1-x^3)/(1-x^2-x^3-x^4).
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MATHEMATICA
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LinearRecurrence[{0, 1, 1, 1}, {1, 0, 2, 1}, 50] (* Harvey P. Dale, Aug 09 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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