20626

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 69.at n=18A020408
• a(n) = T(2*n,n), T given by A026736.at n=8A026737
• a(n) = T(n, floor(n/2)), T given by A026736.at n=16A026742
• Sum of squares of numbers in row n of array T given by A026736.at n=8A027221
• Number of partitions satisfying cn(0,5) + cn(2,5) <= cn(1,5) + cn(4,5) and cn(0,5) + cn(3,5) <= cn(1,5) + cn(4,5).at n=38A039887
• Number of permutations avoiding the patterns {3241,3421,4321}; number of weak sorting class based on 3241.at n=9A111279
• Triangle read by rows: T(n, k) = Sum_{j=0..n} C(j, k)*C(j, n - k).at n=49A119307
• Triangle read by rows: T(n, k) = Sum_{j=0..n} C(j, k)*C(j, n - k).at n=50A119307
• a(n) = 625*n + 1.at n=32A158383
• Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by more than one.at n=10A269584
• Number of distinct variances of nonempty subsets of {1, ..., n}.at n=23A382383
• Expansion of g^2/(1 + x^3*g^3), where g = 1+x*g^3 is the g.f. of A001764.at n=7A391300