87083

Properties

Appears in sequences

• Having specified two initial terms, the "Half-Fibonacci" sequence proceeds like the Fibonacci sequence, except that the terms are halved before being added if they are even.at n=43A120424
• a(0) = 1, a(1) = 3; a(n+2) = (a(n+1) + a(n))/2 if 2 divides (a(n+1) + a(n)), a(n+2) = a(n+1) + a(n) otherwise.at n=43A151749
• Central terms of the triangle in A199333: a(n) = A199333(2*n,n).at n=9A199581
• Central terms of the triangle in A199333: a(n) = A199333(n,[n/2]).at n=18A199582
• Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X n array.at n=3A219464
• Number of nX4 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX4 array.at n=3A219467
• T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nXk array.at n=24A219471
• Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 4Xn array.at n=3A219474
• a(1) = 2; a(n + 1) = smallest prime > a(n) such that a(n + 1) - a(n) is the product of 10 primes.at n=10A285694
• Number of rooted trees with n nodes such that no more than six subtrees of the same size extend from the same node.at n=15A318800
• Number of rooted trees with n nodes such that no more than six isomorphic subtrees extend from the same node.at n=15A318853
• Prime numbersat n=8457