19533

Appears in sequences

• 4-dimensional analog of centered polygonal numbers.at n=16A006322
• Triangle T(n,k) of numbers of proper k-covers of an unlabeled n-set, k=1..2^n-2.at n=28A055127
• Variation of Stechkin's function, A055004.at n=16A062827
• One-sixtieth of the even leg of Pythagorean triangles whose other sides are both primes (other than 3, 5 or 13).at n=44A068485
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=7A151144
• Denominators of convergents to the general continued fraction 1/(1 + 2/(1 + 3/(1 + 4/(1+ ...)))).at n=12A225436
• Number of distinct proper angles that can be formed by a vertex and two leg endpoints on grid points in an n X n square grid.at n=18A252591
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 387", based on the 5-celled von Neumann neighborhood.at n=31A271545
• a(n) = Sum_{k=0..floor(n/3)} binomial(k,3*n-9*k).at n=58A392273