120016

Appears in sequences

• Expansion of g.f.: (1+x - sqrt(1-2*x-3*x^2-4*x^3))/(2+2*x+2*x^2).at n=14A108629
• Generalized Catalan numbers C(2,6;n)=C(6,2;n).at n=5A116876
• a(n) is the number of binary strings of length n not containing the substrings 0000, 0001, 0011, 0111, 1111.at n=26A373080