28708

Appears in sequences

• a(n) = a(n-1) + a(n - 1 minus the number of terms of a(k) == n (mod 3) so far).at n=45A060730
• Leading diagonal of triangle in A079836.at n=5A079837
• Number of subsets {x(1),x(2),...,x(k)} of {1,2,...,n} such that all differences |x(i)-x(j)| are distinct.at n=25A143823
• Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155374
• Expansion of x * phi(x) * psi(x^14) / (f(-x) * f(-x^7)) in powers of x where phi(), psi(), f() are Ramanujan theta functions.at n=31A193883
• Number of permutations of length n containing exactly 2 occurrences of 1234 and 2 occurrences of 1243.at n=9A224294
• Number of (n+5)X6 0..1 matrices with each 6X6 subblock idempotent.at n=6A224570
• Number of (n+5)X12 0..1 matrices with each 6X6 subblock idempotent.at n=0A224576
• T(n,k)=Number of (n+5)X(k+5) 0..1 matrices with each 6X6 subblock idempotent.at n=21A224577
• T(n,k)=Number of (n+5)X(k+5) 0..1 matrices with each 6X6 subblock idempotent.at n=27A224577
• Number of integer partitions of n into relatively prime parts that are all greater than 1.at n=49A302698