2066242608

Appears in sequences

• One quarter the number of nX3 1..4 arrays with no two neighbors of any element equal to each other.at n=16A183355
• Number of 3Xn binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=18A188825
• a(1) = 1, a(2) = 2, a(3) = 5; thereafter a(n) = 2 * Sum_{k=1..n-1} a(k).at n=20A257970
• Number of n-valued logics.at n=3A262459
• a(n) is the determinant of an n X n Hermitian Toeplitz matrix whose first row consists of n, (n-1)*i, (n-2)*i, ..., 3*i, 2*i, i, where i denotes the imaginary unit.at n=9A359561