112848

Appears in sequences

• a(n) = C(3n,n) - C(2n,n).at n=7A000846
• 6-dimensional centered tetrahedral numbers.at n=14A008500
• 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), (-1, 1, 0), (0, 0, 1), (1, 0, -1)}.at n=12A148285
• a(n) = 196*n^2 - 2*n.at n=23A158224
• a(n) = Sum_{k=0..floor(n/3)} (4*k+1) * binomial(2*n-2*k+1,n-3*k)/(2*n-2*k+1).at n=11A390478