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A117567
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Riordan array ((1+x^2)/(1-x^3),x).
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2
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1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1
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OFFSET
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0,1
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COMMENTS
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Sequence array for the sequence F(L((n+2)/3)). Row sums are A093878. Diagonal sums are A051275. Inverse is A117568.
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REFERENCES
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Murat Sahin and Elif Tan, Conditional (strong) divisibility sequences, Fib. Q., 56 (No. 1, 2018), 18-31.
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LINKS
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FORMULA
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Number triangle T(n,k)=F(L((n-k+2)/3))[k<=n] where L(j/p) is the Legendre symbol of j and p.
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EXAMPLE
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Triangle begins
1,
0, 1,
1, 0, 1,
1, 1, 0, 1,
0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1,
1, 1, 0, 1, 1, 0, 1,
0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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