640233domain: NAppears in sequencesG.f.: (1+x^2)/((1-2x)(1-x-x^2)); a(n)=3a(n-1)-a(n-2)-2a(n-3); a(n)=5*2^n-L(n+3); a(n)=sum{k=0..n, (L(k)-0^k)2^(n-k)}.at n=17A099166a(n) = Sum_{k=0..n} binomial(k+7,7) * binomial(k,n-k)^2.at n=8A377159