289328

Appears in sequences

• Number of distinct non-extendable sequences X={x(1),x(2),...,x(k)} where x(1)=1, the x(i)'s are distinct elements of {1,...,n} with |x(i)-x(i+1)|=1 or 2, for i=1,2,...,k.at n=20A054668
• Smallest multiple of the n-th prime beginning and ending in n with a(1)=a(3)=0.at n=27A078212
• Expansion of x/(1 -x^2 -x^4 -x^7 -x^8 -x^9 -x^10).at n=41A143351