2,2
n[ (n-1)/2 ]
a(n)=a(n-1)+2*a(n-2)-2*a(n-3)-a(n-4)+a(n-5). G.f.: -x^3*(3+x)/((1+x)^2*(x-1)^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2009]
Sequence in context: A131179 A079353 A135116 this_sequence A101506 A092434 A031367
Adjacent sequences: A050184 A050185 A050186 this_sequence A050188 A050189 A050190
nonn
Clark Kimberling (ck6(AT)evansville.edu)
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