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A038237
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Second line of 4-wave sequence A038197.
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1
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1, 3, 7, 26, 56, 216, 462, 1791, 3828, 14849, 31735, 123111, 263108, 1020696, 2181389, 8462447, 18085587, 70160958, 149945056, 581694636, 1243173370, 4822748423, 10306975580, 39984728949, 85453685055, 331507764639, 708484485384, 2748484256480, 5873945233705
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: (x^5+x^4-4*x^3-3*x^2+3*x+1)/(x^8-7*x^6+15*x^4-10*x^2+1). - Alois P. Heinz, Jul 16 2009
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MAPLE
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a:= n-> (Matrix([[26, 7, 3, 1, 0, 0, -1, -1]]). Matrix(8, (i, j)-> if i=j-1 then 1 elif j=1 then [0, 10, 0, -15, 0, 7, 0, -1][i] else 0 fi)^n)[1, 4]: seq (a(n), n=0..30); # Alois P. Heinz, Jul 16 2009
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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