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A116409
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Expansion of (1-x-2x^2+sqrt(1-2x-3x^2))/(2(1-x)(1-2x-3x^2)).
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3
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1, 2, 5, 13, 36, 102, 294, 855, 2502, 7352, 21670, 64021, 189489, 561680, 1666955, 4952243, 14725010, 43815836, 130462322, 388670993, 1158491411, 3454558976, 10305303341, 30752447207, 91798204811, 274101391202, 818652308999
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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Conjecture: n*a(n) +2*(-3*n+2)*a(n-1) +2*(4*n-5)*a(n-2) +6*(n-2)*a(n-3) +9*(-n+2)*a(n-4)=0. - R. J. Mathar, Nov 11 2014
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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