40264

Appears in sequences

• Number of UU's (i.e., doublerises) in all skew Dyck paths of semilength n.at n=8A128743
• Number of isomorphism classes of connected 5-regular multigraphs of order 2n, loops allowed.at n=3A129430
• a(n) = n! - binomial(n,3).at n=8A129949
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 1, 1), (0, 0, 1), (0, 1, 0), (1, 0, 0)}.at n=8A151048
• 1/4 the number of (n+1) X 2 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.at n=8A184596
• T(n,k) = 1/4 the number of (n+1) X (k+1) binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.at n=36A184604
• Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=7A253038
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=37A253044
• a(n) = a(n-1) + a(n-2) + 3*a(n-4) - 2*a(n-5) for n >= 5, where a(0) = 2, a(1) = 4, a(2) = 8, a(3) = 13, a(4) = 26.at n=16A288925
• Triangle T(n,k) read by rows (n >= 0, k >= 0) with g.f. 1/(1 - f(0)*x - x*y/(1 - f(1)*x - x*y/(1 - f(2)*x - x*y/(1 - f(3)*x - x*y/(1 - f(4)*x - x*y/(1 - ...)))))) where f(n) = n + 1 for n >= 0.at n=47A383019