22685

Appears in sequences

• a(n) = a(n-1) + a(round(2*(n-1)/3)) + a(round((n-1)/3)) with a(1)=a(2)=1.at n=40A033499
• a(n) = 169*n^2 - 140*n + 29.at n=11A156639
• Positive numbers y such that y^2 is of the form x^2+(x+167)^2 with integer x.at n=9A159777
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209768; see the Formula section.at n=52A209767
• Least number m such that 4*m^2 + 1 is prime and the next prime of this form is 4*(m + A214518(n))^2 + 1.at n=10A214519
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood.at n=32A271416
• Expansion of Sum_{n>=1} q^(n*(n-1)) / (1-q)^n.at n=41A321481
• Number of partitions of n having an integer median.at n=37A325347
• Triangle, read by rows, where the n-th row lists the (n^2+1) coefficients of (1+2*x+...+(n+1)*x^n)^n.at n=43A329709
• a(n) = Sum_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|)/8.at n=32A331773
• Centered square numbers which are sphenic numbers.at n=11A380882