39504

Appears in sequences

• a(0)=0, a(1)=1, a(n)=2*n*(a(n-1)+a(n-2)), n>1.at n=6A179540
• Number of nX2 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=36A200984
• Number of (n+2)X(2+2) 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least two elements with value (x(i,j)+1) mod 3, and upper left element zero.at n=4A230691
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least two elements with value (x(i,j)+1) mod 3, and upper left element zero.at n=16A230694
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least two elements with value (x(i,j)+1) mod 3, and upper left element zero.at n=19A230694
• Number of n-bead necklace structures with beads of exactly four colors and no adjacent beads having the same color.at n=14A328130