22411

Appears in sequences

• Strong pseudoprimes to base 18.at n=16A020244
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=34A031846
• a(n) = (117*n^2 - 99*n + 2)/2.at n=20A050408
• Number of distinct lines through the origin in 3-dimensional cube of side length n.at n=29A090025
• Second differences of A001515 (or A144301).at n=5A144647
• Number of binary strings of length n with equal numbers of 00110 and 01101 substrings.at n=15A164254
• Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways.at n=34A180089
• Number of nonnegative solutions to x^3 + y^3 + z^3 <= n^3.at n=31A224215
• Sum T(n,k) of the entries in the k-th last blocks of all set partitions of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=31A286232
• Number of n-step walks on cubic lattice starting at (0,0,0), ending at (0,floor(n/2),ceiling(n/2)), remaining in the first (nonnegative) octant and using steps (0,0,1), (0,1,0), (1,0,0), (-1,1,1), (1,-1,1), and (1,1,-1).at n=9A328280
• Number T(n,k) of n-step walks on cubic lattice starting at (0,0,0), ending at (0,k,n-k), remaining in the first (nonnegative) octant and using steps (0,0,1), (0,1,0), (1,0,0), (-1,1,1), (1,-1,1), and (1,1,-1); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=49A328300
• Number T(n,k) of n-step walks on cubic lattice starting at (0,0,0), ending at (0,k,n-k), remaining in the first (nonnegative) octant and using steps (0,0,1), (0,1,0), (1,0,0), (-1,1,1), (1,-1,1), and (1,1,-1); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=50A328300
• a(n) is the number of order-n magic triangles composed of the numbers from 1 to n(n+1)/2 in which the sum of the k-th row and the (n-k)-th row is same for all k and all three directions, counted up to rotations and reflections.at n=5A356643