20208

Appears in sequences

• Theta series of direct sum of 2 copies of f.c.c. lattice.at n=29A008663
• A Chebyshev transform of 3^n.at n=10A090413
• Number of productions of a certain "divide-and-conquer" context-free grammar in Chomsky normal form that generates all permutations of n symbols.at n=11A092285
• a(n) = 16*(8*prime(n) + 7).at n=36A098823
• Numbers k such that 4*R_k + 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=8A099414
• n-th central term of triangle A118032 divided by n+1 for n>=0, where the matrix square of A118032 forms a diagonal bisection of A118032.at n=13A118039
• a(n) = a(n-1) + a(n-2) + a(n-3) - a(n-4) with a(0)=0, a(1)=1, a(2)=2 and a(3)=3.at n=19A135431
• 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), (0, 0, 1), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.at n=7A151168
• Row sums of A163233 and A163235.at n=32A163242
• Number of 6-step left-handed knight's tours (moves only out two, left one) on an n X n board summed over all starting positions.at n=13A187176
• Number of nX2 0..3 arrays with the row and column sums nondecreasing.at n=4A202576
• Number of nX5 0..3 arrays with the row and column sums nondecreasing.at n=1A202579
• T(n,k)=Number of nXk 0..3 arrays with the row and column sums nondecreasing.at n=16A202581
• T(n,k)=Number of nXk 0..3 arrays with the row and column sums nondecreasing.at n=19A202581
• Number of (n+1) X 6 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.at n=7A207047
• Triangle of coefficients of polynomials v(n,x) jointly generated with A209133; see the Formula section.at n=51A209134
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 726", based on the 5-celled von Neumann neighborhood.at n=35A273451
• Number of nX4 0..1 arrays with every element equal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=9A297939