2019404

Appears in sequences

• Number of binary strings of length n with no substrings equal to 0001 0100 or 0110.at n=25A164463
• a(n) = 2*a(n-1) - a(n-2) + a(n-4) for n>3, a(0)=0, a(1)=a(2)=2, a(3)=3.at n=31A286350
• a(n) = a(n-2) - 2*a(n-3) + a(n-4) for n>3, a(0)=0, a(1)=2, a(2)=-1, a(3)=3.at n=31A286390
• Upper (1/2)-midsequence of F(n) and F(n+4), where F = A000045 (Fibonacci numbers); see Comments.at n=29A390351