208010

Appears in sequences

• a(n) = floor(Fibonacci(n)/4).at n=30A004697
• Denominators of continued fraction convergents to sqrt(20).at n=9A041031
• Denominators of continued fraction convergents to sqrt(180).at n=9A041333
• Squarefree part of F(n) (the Fibonacci numbers): the smallest number such that a(n)*F(n) is a square.at n=29A069110
• Number of permutations satisfying -k <= p(i) - i <= r and p(i) - i not in I, i=1..n, with k=1, r=5, I={1,3}.at n=27A079962
• Catalan numbers minus 2.at n=12A120304
• "Stapled" intervals are defined in A090318. Call a stapled interval "maximal" if it is not a proper subinterval of any other stapled interval. Sequence gives starting points of maximal stapled intervals.at n=19A130170
• "Stapled" intervals are defined in A090318. Call a stapled interval "minimal" if it does not contain any proper stapled subinterval. Sequence gives starting points of minimal stapled intervals.at n=19A130171
• Starting points of stapled intervals.at n=27A130173
• a(n) = a(n-1) + a(n-2) + 1 if n is a multiple of 6, otherwise a(n) = a(n-1) + a(n-2).at n=26A131132
• Number of (1,0)-steps of weight 1 at level 0 in all weighted lattice paths in L_n.at n=14A182890
• Starting points of stapled intervals of length 17.at n=13A194585
• Numbers x such that 20*x^2 + 1 is a perfect square.at n=5A207832
• a(1) = a(2) = 1; for n > 2, a(n) is the product of prime factors of the n-th Fibonacci number.at n=29A238684
• Number of Dyck paths of semilength n such that no level has more than ten peaks.at n=12A287974
• Catalan numbers - 2 (A120304) with first three terms changed to 1,1,1.at n=12A289652
• Catalan numbers - 2 (A120304) with first four terms changed to 1,1,1,4.at n=12A289653
• a(n) is the least integer k such that k/Fibonacci(n) > 1/4.at n=30A293552
• a(n) is the integer k that minimizes |k/Fibonacci(n) - 1/4|.at n=30A293553