2126747701

Appears in sequences

• Expansion of (1+2*x)/(1-6*x+x^2).at n=12A054488
• Combined Diophantine Chebyshev sequences A054488 and A077413.at n=24A077241
• a(2n) = -A106328(n), a(2n+1) = A054488(n).at n=25A108931