28842

Appears in sequences

• Number of triangular regions in regular n-gon with all diagonals drawn.at n=35A062361
• Number of closed walks of length n at a base vertex of a truncated tetrahedron (triangular prism).at n=11A094554
• 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, 1), (-1, 0, 0), (0, 1, -1), (1, -1, -1), (1, 1, 0)}.at n=10A148601
• The fourth left hand column of triangle A167552.at n=8A168302
• Wiener index of the Moebius ladder M(n).at n=37A180857
• a(n) = lcm(n,n+1,n+2,n+3,n+4,n+5,n+6)/420.at n=18A189144
• Let x(1)x(2)...x(q) the decimal expansion of the numbers k having exactly q distinct prime divisors p(1) < p(2) < ... < p(q). Sequence lists the numbers k such that p(1)/x(1) + p(2)/x(2) + ... + p(q)/x(q) is an integer.at n=17A235152
• Let x(1)x(2)...x(q) the decimal expansion of the numbers k having exactly q distinct prime divisors p(1) < p(2) < ... < p(q). Sequence lists the numbers k such that p(1)/x(q) + p(2)/x(q-1)+ ... + p(q)/x(1) is an integer.at n=28A235153
• a(n) = (12*n)!*(2*n)!/((9*n)!*(4*n)!*n!).at n=2A295444
• Number of achiral polyominoes composed of n tetrahedral cells of the hyperbolic regular tiling with Schläfli symbol {3,3,oo}.at n=15A371351
• Composite squarefree integers for which the sum of the squares of their factors is a square.at n=20A379780