20098

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 61.at n=32A020400
• a(n) = floor( Sum_{1 <= i < j <= n} ((sqrt(j)-sqrt(i))^3) ).at n=46A025197
• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026637.at n=7A026967
• Numbers whose set of base-11 digits is {1,4}.at n=38A032823
• a(n) = binomial(n,0) - binomial(n,2) + binomial(n,4).at n=28A058923
• Number of free hexagonal polygons of symmetry class C_(2h) and area n.at n=16A121210
• Number of length 2+2 0..n arrays with some pair in every consecutive three terms totalling exactly n.at n=24A245871
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 406", based on the 5-celled von Neumann neighborhood.at n=39A271772
• a(n) = Sum_{k=0..floor(3*n/8)} binomial(k+2,2) * binomial(k,3*n-8*k).at n=33A392316