43947

Appears in sequences

• a(n) = (2^n+1)*(2^n+2)/6.at n=9A007581
• Number of proper T_1-hypergraphs with 3 labeled nodes and n hyperedges.at n=19A056078
• Number of periodic palindromic structures using a maximum of four different symbols.at n=19A056505
• Triangle of partial sums of Stirling numbers of 2nd kind (A008277): T(n,k) = Sum_{i=1..k} Stirling2(n,i), 1<=k<=n.at n=48A102661
• 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=10A124303
• Integers arising in A133677.at n=29A133645
• 1/256 the number of (n+1) X 3 0..3 arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=2A183821
• 1/256 the number of (n+1)X4 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=1A183822
• T(n,k)=1/256 the number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=7A183827
• T(n,k)=1/256 the number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.at n=8A183827
• Number of nX2 0..3 arrays with rows and columns in nondecreasing order.at n=5A184122
• Number of nX6 0..3 arrays with rows and columns in nondecreasing order.at n=1A184126
• T(n,k)=Number of nXk 0..3 arrays with rows and columns in nondecreasing order.at n=22A184129
• T(n,k)=Number of nXk 0..3 arrays with rows and columns in nondecreasing order.at n=26A184129
• Second pentagonal numbers that are interprime.at n=20A205881
• 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=4A208402
• 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=19A208408
• Number of 5Xn 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=1A208412
• Number of oriented rational links with crossing number n.at n=16A329908