1042970

Appears in sequences

• Number of ternary words of length n (beginning 0) with autocorrelation function 2^(n-1)+2.at n=15A045696
• Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant and ending in the (+,+) quadrant if n even, in the (+,-) quadrant if n odd.at n=15A076906
• Meandric numbers for a river (or directed line) crossing two perpendicular roads at n points, beginning in the (-,-) quadrant, crossing x axis first and ending in any quadrant.at n=15A077551