665855

Appears in sequences

• Number of not-necessarily-symmetric n X 2 crossword puzzle grids.at n=14A034182
• Values of k such that {s(1),...,s(k)} is a palindrome, where {s(1),s(2),...} is the fixed point of the substitutions 0->1 and 1->110.at n=28A098894
• Expansion of (1+4*x+x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=14A114696