20291

Appears in sequences

• Expansion of (2 + x + x^2)/((1 - x)*(1 - x - x^2)).at n=17A026390
• floor[2^n/Fibonacci(n)].at n=42A057861
• Numbers n for which there are exactly ten k such that n = k + reverse(k).at n=18A072434
• Main diagonal of table A083044.at n=15A083045
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.at n=13A146869
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (1, -1, 1), (1, 0, -1), (1, 0, 0)}.at n=10A148251
• Consider the spiral of Theodorus (A072895). This sequence gives the number of k successive triangles which is closer to 360 degrees than any previous k triangles.at n=6A224269
• Number T(n,k) of isoscent sequences of length n with exactly k ascents; triangle T(n,k), n>=0, 0<=k<=n+3-ceiling(2*sqrt(n+2)), read by rows.at n=34A242351
• Number of isoscent sequences of length n with exactly two ascents.at n=6A243228
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 395", based on the 5-celled von Neumann neighborhood.at n=32A271687
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 414", based on the 5-celled von Neumann neighborhood.at n=36A272014
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 430", based on the 5-celled von Neumann neighborhood.at n=36A272116
• Number of compositions of n such that every subsequence has a different sum.at n=48A335357
• Numbers that are the sum of eight fourth powers in exactly eight ways.at n=22A345840