101801domain: NAppears in sequencesExpansion of 1/((1-3x)(1-6x)(1-8x)(1-11x)).at n=4A028081a(n) = (1/2) * Sum_{k=0..floor(n/4)} 2^k * binomial(2*n-6*k+2,2*k+1).at n=16A387601