0,3

Diagonal sums of number triangle A115268.

G.f.: (1+x+x^2+x^3)(1+x^2+x^4+x^6)/((1-x^4)^2*(1-x^8)^2*(1-x^3)); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, [j<=k]*floor((k-j+4)/4)*[j<=n-2k]*floor((n-2k-j+4)/4)}}.

Adjacent sequences: A115267 A115268 A115269 this_sequence A115271 A115272 A115273

Sequence in context: A008770 A030068 A008769 this_sequence A027588 A131995 A060714

easy,nonn

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