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A132835
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Largest terms a(n) forming a self-convolution cube of an integer sequence (A132836) such that: a(n) <= 3*a(n-1) for n>0 with a(0)=1.
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4
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1, 3, 9, 25, 75, 225, 674, 2022, 6066, 18196, 54588, 163764, 491291, 1473873, 4421619, 13264856, 39794568, 119383704, 358151111, 1074453333, 3223359999, 9670079995, 29010239985, 87030719955, 261092159865, 783276479595
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OFFSET
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0,2
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LINKS
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PROG
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(PARI) {a(n)=local(B=[1], R); if(n==0, 1, for(k=1, n, t=3*a(k-1); B=concat(B, t); R=Vec(Ser(B)^(1/3))[ #B]; B[ #B]=t-(numerator(R)%3)*(denominator(R)-1)/2 )); B[n+1]}
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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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