1070244

Appears in sequences

• a(n) = (tan(1*Pi/9))^(2*n) + (tan(2*Pi/9))^(2*n) + (tan(3*Pi/9))^(2*n) + (tan(4*Pi/9))^(2*n).at n=4A353410
• a(n) = Sum_{k=0..n} tan(k*Pi/(1+2*n))^(2*n).at n=4A376777
• Array read by ascending antidiagonals: A(n, k) = Sum_{j=0..k} tan(j*Pi/(1 + 2*k))^(2*n).at n=40A377657