293479domain: NAppears in sequencesa(n) = Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 2,3,4.at n=20A049876Bisection of A051846, divided by the term position.at n=3A051847a(n) = -4*((n-1)*(n+1)^(n+1)+1)/(((-1)^n-3)*n^3).at n=6A221740