5846414

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=19A006356
• 3-wave sequence starting with 1, 1, 1.at n=40A038196
• Top line of 3-wave sequence A038196, also bisection of A006356.at n=10A038213
• Expansion of (1-x)/(1-2*x-x^2+x^3).at n=20A077998
• Expansion of x*(1-x)/(1-2*x-x^2+x^3).at n=21A106803
• a(n) is the number of symmetrical linear hydrocarbon chains with n C-C bonds.at n=37A370377
• Expansion of x + 1/(-x - 1/(-x - 1/(-x + 1))).at n=19A373567