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A051398
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a(n) = -(n-3)*a(n-1) + 2*(n-2)^2.
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1
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2, 6, 6, 14, -6, 102, -514, 3726, -29646, 267014, -2669898, 29369166, -352429654, 4581585894, -64142202066, 962133031502, -15394128503454, 261700184559366, -4710603322067866, 89501463119290254, -1790029262385804198, 37590614510101889126
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OFFSET
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3,1
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LINKS
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FORMULA
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MATHEMATICA
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a[3]=2; a[n_]:=a[n]=-(n-3)*a[n-1]+2*(n-2)^2; Array[a, 22, 3] (* Stefano Spezia, Sep 16 2022 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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