37456650

Appears in sequences

• G.f. satisfies: A(x) = (1 + x*A(x)^2)^3.at n=8A212072
• a(n) = Product_{d|n, d>1} (d - 1).at n=47A377484
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} a(5*k) * a(n-1-5*k).at n=42A386379
• Number of achiral polyominoes with n heptagonal cells of the hyperbolic regular tiling with Schläfli symbol {7,oo}.at n=17A389563