0,2

a(n)=4*4^n/3-5/6-n3^(n-1)+3^n/2

O.g.f.: (1-6*x+7*x^2+8*x^3)/[(-1+x)(-1+4*x)(-1+3*x)^2]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008

Adjacent sequences: A083585 A083586 A083587 this_sequence A083589 A083590 A083591

Sequence in context: A128349 A001834 A099393 this_sequence A149759 A149760 A149761

easy,nonn

Paul Barry (pbarry(AT)wit.ie), May 01 2003