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A145028
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Tetranacci numbers: a(n)=a(n-1)+a(n-2)+a(n-3)+a(n-4), {1,2,3,4...}.
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0
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1, 2, 3, 4, 10, 19, 36, 69, 134, 258, 497, 958, 1847, 3560, 6862, 13227, 25496, 49145, 94730, 182598, 351969, 678442, 1307739, 2520748, 4858898, 9365827, 18053212, 34798685, 67076622, 129294346, 249222865, 480392518, 925986351, 1784896080
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OFFSET
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1,2
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LINKS
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FORMULA
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G.f.: x*(1-x)*(1+2*x+2*x^2)/(1-x-x^2-x^3-x^4). [Colin Barker, Jan 11 2012]
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MATHEMATICA
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LinearRecurrence[{1, 1, 1, 1}, {1, 2, 3, 4}, 30]
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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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