747274

Appears in sequences

• a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=2.at n=25A024723
• Number of tatami tilings of a 7 X n grid (with monomers allowed).at n=20A192093