66016

Appears in sequences

• Pisot sequence E(9,19), a(n)=[ a(n-1)^2/a(n-2)+1/2 ].at n=12A014005
• Number of n X 4 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing.at n=19A224142
• L.g.f.: -log( Sum_{n=-oo..+oo} (-p)^n * (p*x)^(n^2) ) = Sum_{n>=1} a(n) * x^n/n, where p = sqrt(3).at n=9A337968
• For 1<=x<=n, 1<=y<=n, write gcd(x,y) = u*x+v*y with u,v minimal; a(n) = n^4*s, where s is the population variance of the values of |v|.at n=13A345690
• Number of edge covers of the fan graph F_{n,3}.at n=4A373293