700075

Appears in sequences

• a(n) = (2^n+1)*(2^n+2)/6.at n=11A007581
• Number of periodic palindromic structures using a maximum of four different symbols.at n=23A056505
• 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=12A124303
• 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=5A208402
• 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=26A208408
• Number of 6Xn 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=1A208413
• Number of oriented rational links with crossing number n.at n=20A329908
• a(n) = Sum_{k=0..n} Stirling2(3*n,k).at n=4A392772