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A134683
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Expansion of 1+x*(2+3*x)/(1-4*x^2).
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5
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1, 2, 3, 8, 12, 32, 48, 128, 192, 512, 768, 2048, 3072, 8192, 12288, 32768, 49152, 131072, 196608, 524288, 786432, 2097152, 3145728, 8388608, 12582912, 33554432, 50331648, 134217728, 201326592, 536870912, 805306368, 2147483648, 3221225472
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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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a(n) = 2*a(n-1)-(-1)^n*A131577(n-1), n>0.
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MAPLE
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if n =0 then
1 ;
else
-(-1)^n*A131577(n-1)+2*procname(n-1) ;
end if;
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MATHEMATICA
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CoefficientList[Series[1 + x*(2 + 3*x)/(1 - 4*x^2), {x, 0, 32}], x] (* Amiram Eldar, Aug 18 2022 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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