752461609

Appears in sequences

• a(n) = 2*a(n-1) + a(n-2) - a(n-3) for n >= 3, starting with a(0) = 1, a(1) = 3, and a(2) = 6.at n=25A006356
• Top line of 3-wave sequence A038196, also bisection of A006356.at n=13A038213
• Expansion of (1-x)/(1-2*x-x^2+x^3).at n=26A077998
• Expansion of x*(1-x)/(1-2*x-x^2+x^3).at n=27A106803
• Expansion of x + 1/(-x - 1/(-x - 1/(-x + 1))).at n=25A373567