-1203

Appears in sequences

• Triangle T(n,k), read by rows, defined by T(n,k)=3*T(n-1,k)-T(n-1,k-1)-T(n-2,k), T(0,0)=1, T(1,0)=2, T(1,1)=-1, T(n,k)=0 if k<0 or if k>n.at n=41A123971
• Triangle, matrix inverse of A124733, companion to A123965.at n=41A126124
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 297", based on the 5-celled von Neumann neighborhood.at n=19A271151
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 489", based on the 5-celled von Neumann neighborhood.at n=25A272513
• Expansion of q^(-2/5) * (r(q^2) - r(q)^2) / 2 in powers of q where r() is the Rogers-Ramanujan continued fraction.at n=55A285554