193530835

Appears in sequences

• a(3)=1; a(n) = Sum_{i=1..n-3} binomial(n-4,i-1)*binomial(n,i+1)*a(i+2)*a(n-i)*i*(n-i-2)/(2*(n-1)) for n > 3.at n=7A115047
• Number of order-7 ribbon tilings for a 7 X n strip.at n=13A364427