118549domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n)=Sum{a(k): k=0,1,2,...,n-3,n-1}; a(n-2) is not a summand; 2 initial terms required.at n=21A049854Transform of the finite sequence (1, 0, -1) by the T_{1,0} transformation (see link).at n=14A159336Prime numbersat n=11177