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A130713
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a(0)=a(2)=1, a(1)=2, a(n)=0 for n>2.
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2
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1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Self-convolution of A019590. Up to a sign the convolutional inverse of the natural numbers sequence. - Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 14 2007
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FORMULA
| G.f.: 1+2*x+x^2.
a(n)=[C((n+2)^2,n+4) mod 2]+2*[C((n+1)^2,n+3) mod 2]+[C(n^2,n+2) mod 2] - Paolo P. Lava (paoloplava(AT)gmail.com), Dec 19 2007
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CROSSREFS
| Sequence in context: A060838 A097470 A033322 * A085857 A056620 A178401
Adjacent sequences: A130710 A130711 A130712 * A130714 A130715 A130716
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr) and Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 01 2007
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