1757184

Appears in sequences

• E.g.f.: x^3*exp(x)^2.at n=13A052771
• Number of 4 X n binary matrices avoiding simultaneously the right angled numbered polyomino patterns (ranpp) (10;0) and (01;1).at n=11A100313
• a(n) = 4^n * A000108(n+1).at n=6A269796
• Riordan array ((1-x)^(m-1), x/(1-x)) with factor r^(2*n) on row n, for m = 3/2, r = 2.at n=41A380851