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Search: id:A140725
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| 0, 1, 4, 10, 34, 94, 298, 862, 2650, 7822, 23722, 70654, 212986, 636910, 1914826, 5736286, 17225242, 51642958, 154994410, 464852158, 1394818618, 4183931566, 12552843274, 37656432670, 112973492314, 338912088334, 1016753042218
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OFFSET
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0,3
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FORMULA
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a(n)= (-1)^n*A091003(n), n>0.
a(n+1)-3a(n)=(-1)^(n+1)*A000079(n-1), n>0.
|a(n+1)-3a(n)|=A011782(n).
O.g.f.: (1+3x)x/((1+2x)(1-3x)). a(n)=((-2)^n+4*3^n)/10, n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2008
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CROSSREFS
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Cf. A083421 (bin. transform of (0 followed by A037481)).
Sequence in context: A066454 A022445 A091003 this_sequence A005630 A100507 A156700
Adjacent sequences: A140722 A140723 A140724 this_sequence A140726 A140727 A140728
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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), Jul 12 2008
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2008
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