58640

Appears in sequences

• Number of n X n binary matrices with every 1 having at most 3 adjacent 1's.at n=4A068472
• a(n) = n * n! * b(n), where b(n) = ((n-1)*(n-3)*b(n-1) - b(n-2) + b(n-3))/(n*(n - 1)) and b(0) = b(1) = 1, b(2) = -1.at n=10A158802
• G.f.: A(x) = exp( Sum_{n>=1} A000172(n)^n*x^n/n ) where Franel number A000172(n) = Sum_{k=0..n} C(n,k)^3.at n=3A216354