57009

Appears in sequences

• Numerators of continued fraction convergents to sqrt(95).at n=8A041170
• a(n) = 1 - 2*n^2 + 4*n*(1 + 2*n^2)/3.at n=28A168547
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=2, k=1 and l=-1.at n=9A176828
• Number of permutations i_0, i_1, ..., i_n of 0, 1, ..., n with i_0 = 0 and i_n = n such that the n+1 numbers i_0^2+i_1, i_1^2+i_2, ..., i_{n-1}^2+i_n, i_n^2+i_0 are all relatively prime to both n-1 and n+1.at n=13A229130