0,2

a(0)=1; a(n+1)=3*a(n)-n; a(n)=(3^n+2*n+3)/4

a(n)=5*a(n-1)-7*a(n-2)+3*a(n-3). G.f.: -(1-3*x+x^2)/((3*x-1)*(x-1)^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 09 2009]

Sequence in context: A135307 A000083 A092668 this_sequence A014137 A007476 A129698

Adjacent sequences: A164036 A164037 A164038 this_sequence A164040 A164041 A164042

nonn

Rolf Pleisch (r_pleisch(AT)gmx.ch), Aug 08 2009