94525

Appears in sequences

• Unidirectional 'Delannoy' variation of the Boustrophedon transform applied to all 1's sequence: construct an array in which the first element of each row is 1 and subsequent entries are given by T(n,k) = T(n,k-1) + T(n-1,k-1) + T(n-1,k) + T(n-2,k-1). The last number in row n gives a(n).at n=8A064641
• Triangle defined in A064641 read by rows.at n=44A064642
• Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 2.at n=13A066454
• Numbers n such that phi(phi(n)) + sigma(sigma(n)) is a 4th power.at n=37A172464
• Triangle read by rows: let T(n,k) (for n >= 0, 0 <= k <= n) be the number of walks from (0,0) to (n,k) using steps (1,1), (1,0), (1,-1) and (0,-1); n-th row of triangle gives T(n,n), T(n,n-1), ..., T(n,0).at n=44A223092
• Number of vertices formed inside a square with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order n = A006842(n,k)/A006843(n,k), k = 1..A005728(n).at n=5A358887