25444

Appears in sequences

• E.g.f. exp(tan(x) + sec(x) - 1).at n=8A000772
• Number of ways to place zero or more nonadjacent 1,1 2,1 3,1 4,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155280
• Number of length 3+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero.at n=18A250322
• Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.at n=4A260062
• Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.at n=4A260067
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.at n=40A260070
• Numbers n such that the decimal number concat(9,n) is a square.at n=28A273364
• a(n) = 1/n times the number of n-colorings of the complete bipartite graph K_(n,n).at n=4A282245