-21929

Appears in sequences

• a(n) = (1/2+1/2*i*sqrt(11))^n + (1/2-1/2*i*sqrt(11))^n, where i=sqrt(-1).at n=16A131040
• a(n) = Sum_{k=0..n} (-1)^k * binomial(n,k^2).at n=17A307093