131985

Appears in sequences

• 1/9 the number of (n+1) X 7 0..2 arrays with all 2 X 2 subblocks having the same four values.at n=15A184045
• E.g.f.: exp( Sum_{n>=1} n!^2*x^(2*n)/(2*n)! ) = Sum_{n>=0} a(n)*x^(2*n)/(2*n)!.at n=5A193441
• Triangle read by rows: T(n,k) is the number of labeled connected planar graphs on n vertices and k edges.at n=29A288265
• Triangle read by rows: T(n,k) is the number of labeled planar graphs on n vertices and k edges.at n=51A288266