70449

Appears in sequences

• a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = (F(2), F(3), F(4), ...).at n=17A025105
• Numbers whose set of base-16 digits is {1,3}.at n=36A032923
• Number of strings of n numbers x(i) in -4..4 with sums of x(i) and of x(i)*x(i+1) both zero.at n=7A183939
• T(n,k)=Number of strings of n numbers x(i) in -k..k with sums of x(i) and of x(i)*x(i+1) both zero.at n=62A183944