28716
domain: N
Appears in sequences
- Numbers n such that x^n + x^5 + x^4 + x^3 + x^2 + x + 1 is irreducible over GF(2).at n=54A057484
- First differences of indices of A000043.at n=32A135701
- Number of permutations of 1..n with all differences of elements separated by distances 1 through 6 being respectively unique.at n=15A170812
- Number of idempotent 4 X 4 0..n matrices of rank 1.at n=12A224526
- Number of (n+2)X(1+2) 0..2 arrays with each 3X3 subblock having the sum of its 72 absolute element differences equal to 34.at n=1A234834
- Number of (n+2)X(2+2) 0..2 arrays with each 3X3 subblock having the sum of its 72 absolute element differences equal to 34.at n=0A234835
- T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock having the sum of its 72 absolute element differences equal to 34.at n=1A234838
- T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock having the sum of its 72 absolute element differences equal to 34.at n=2A234838
- Number of chordless cycles in the n X n torus grid graph.at n=3A297669
- a(n) = 27*n^2 - 21*n + 6 (n>=1).at n=32A304164