11188907

Appears in sequences

• a(n) = (2^n+1)*(2^n+2)/6.at n=13A007581
• Number of periodic palindromic structures using a maximum of four different symbols.at n=27A056505
• Number of set partitions of length <= 4; sum of first 4 columns of triangle of Stirling numbers of 2nd kind; dimension of space of symmetric polynomials in 4 noncommuting variables.at n=14A124303
• Number of n X 2 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.at n=6A208402
• T(n,k) is the number of n X k 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.at n=34A208408
• Number of 7Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.at n=1A208414
• Number of oriented rational links with crossing number n.at n=24A329908