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Search: id:A133140
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| A133140 |
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Sum of the coefficients of the polynomial Q(n,x)=(1+x)[(1+x)^(n-1)+x^(n-1)], Q(0,x)=2. |
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+0
2
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| 2, 4, 6, 10, 18, 34, 66, 130, 258, 514, 1026, 2050, 4098, 8194, 16386, 32770, 65538, 131074, 262146, 524290, 1048578, 2097154, 4194306
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OFFSET
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0,1
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COMMENT
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Also row sums of A133138. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 12 2008
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FORMULA
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a(n)=2*A094373(n). a(n)=A052548(n), n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 12 2008
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CROSSREFS
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Sequence in context: A102477 A018074 A000067 this_sequence A026680 A034872 A032362
Adjacent sequences: A133137 A133138 A133139 this_sequence A133141 A133142 A133143
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 21 2007
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 12 2008
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