-921

Appears in sequences

• Expansion of 1/(1+x+x^2+2*x^3).at n=25A077976
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 133", based on the 5-celled von Neumann neighborhood.at n=19A270235
• Expansion of Product_{k>=1} (1-x^(k^2))^(k^2).at n=41A291696
• Deficiency of prime-shifted squares: a(n) = 2*A003961(n^2) - sigma(A003961(n^2)), where A003961 is fully multiplicative function with a(prime(i)) = prime(i+1).at n=29A378231