0,2

Row sums of number triangle A115268.

G.f.: (1+x+x^2+x^3)^2/((1-x^4)^4*(1-x^2)); a(n)=sum{k=0..n, sum{j=0..n, [j<=k]*floor((k-j+4)/4)*[j<=n-k]*floor((n-k-j+4)/4)}}.

Sequence in context: A094866 A072951 A062766 this_sequence A103692 A114921 A103442

Adjacent sequences: A115266 A115267 A115268 this_sequence A115270 A115271 A115272

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jan 18 2006