156672

Appears in sequences

• Coefficient triangle of polynomials (falling powers) related to convolutions of A002605(n), n>=0, (generalized (2,2)-Fibonacci). Companion triangle is A073403.at n=11A073404
• Coefficient triangle of polynomials (rising powers) related to convolutions of A002605(n), n>=0, (generalized (2,2)-Fibonacci). Companion triangle is A073405.at n=13A073406
• a(n) = smallest k such that tau(k)= n*tau(k-1) where tau(k) = number of divisors of k, or 0 if no such number exists.at n=32A086551
• T(n,k) = Number of n-turn rook's tours on a k X k board summed over all starting positions.at n=51A187189
• Number of 7-turn rook's tours on an n X n board summed over all starting positions.at n=3A187194
• a(n) = Sum_{0 < x,y,z,t <= n and gcd(x^2 + y^2 + z^2 + t^2, n)=1} gcd(x^2 + y^2 + z^2 + t^2 - 1, n).at n=16A239613
• Solutions y to the negative Pell equation y^2 = 72*x^2 - 73728 with x,y >= 0.at n=4A281238
• (1/8) times the sum of the elements of all subsets of [n] whose sum is divisible by eight.at n=17A309300
• a(n) = Sum_{k=1..n} sigma(k)*sigma(2*k), where sigma(n) = A000203(n) is the sum of the divisors of n.at n=39A347108