123871

Appears in sequences

• Triangle of numbers related to the generalized Catalan sequence C(2;n+1)=A064062(n+1), n>=0.at n=41A113647
• Fourth diagonal (M=4) sequence of triangle A113647, called Y(2,1).at n=5A115151
• Expansion of x * (x+1) * (x^3-x^2-1) / ((x^2+1) * (x^3+x^2-1)).at n=44A122519
• a(0) = a(1) = a(2) = a(3) = 1; thereafter a(n) = a(n-1) + a(n-2) + a(n-4).at n=23A307677