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Search: id:A135574
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A135574 A024495 but with terms swapped in pairs. +0
3
0, 0, 3, 1, 11, 6, 42, 21, 171, 85, 683, 342, 2730, 1365, 10923, 5461, 43691, 21846, 174762, 87381, 699051, 349525, 2796203, 1398102, 11184810, 5592405, 44739243, 22369621, 178956971, 89478486, 715827882, 357913941, 2863311531, 1431655765 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n+1)-2a(n) = A135575(n).

O.g.f.: -x^2*(3+2*x^2+x+3*x^3)/[(2*x-1)(x^2-x+1)(2*x+1)(x^2+x+1)] . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008

MAPLE

A024495 := proc(n) option remember ; if n <=1 then 0; elif n = 2 then 1; else 3*procname(n-1)-3*procname(n-2)+2*procname(n-3) ; fi; end: A135574 := proc(n) option remember ; if n mod 2 = 0 then A024495(n+1) ; else A024495(n-1) ; fi; end: seq(A135574(n), n=0..40) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]

CROSSREFS

Sequence in context: A110165 A111965 A110440 this_sequence A008969 A119908 A153257

Adjacent sequences: A135571 A135572 A135573 this_sequence A135575 A135576 A135577

KEYWORD

nonn,easy

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Feb 24 2008

EXTENSIONS

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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