50020

Appears in sequences

• a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026907.at n=11A026916
• Numbers where k-th digit from right is either 0 or k.at n=18A063013
• Number of right triangles whose vertices are lattice points in {1,2,...,n} X {1,2,...,n}.at n=12A077435
• Triangle, read by rows, where diagonal m of T equals diagonal m-1 of matrix power T^m for m>1: T(n,k) = [T^(n-k)](n-1,k) for n>=k>0, with T(n,n)=1 and T(n+1,n)=n+1 for n>=0.at n=21A132471
• Column 0 of triangle A132471.at n=6A132472
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 5.at n=55A136882
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 5.at n=34A136897
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 7.at n=50A136899
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 26880.at n=41A266397
• Sum of the areas of the distinct rectangles (and the areas of the squares on their sides) with positive integer sides such that L + W = n, W < L.at n=40A294139
• a(n) = 16^n * Sum_{k=0..n} (-1)^k*binomial(1/2, k)^2.at n=4A358363