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A185097
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a(1)=1; thereafter a(n+1) = T(8*a(n)), where T(i)=i*(i+1)/2 is the i-th triangular number.
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2
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OFFSET
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1,2
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COMMENTS
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All terms are square and triangular; a subsequence of A001110.
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REFERENCES
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C. Alsina and R. B. Nelson, Charming Proofs: A Journey into Elegant Mathematics, MAA, 2010. See p. 4.
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LINKS
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FORMULA
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MAPLE
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T:=n->n*(n+1)/2; t1:=[1]; for n from 1 to 7 do t1:= [op(t1), T(8*t1[nops(t1)])]; od: t1;
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MATHEMATICA
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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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