42944

Appears in sequences

• The number of distinct principal ideals in the semigroup of binary relations on an n-set.at n=5A007903
• a(n) = (1/n!)*A001565(n).at n=34A094792
• Unsigned row sums of triangle A114700.at n=21A116466
• Sequence of which A078783 is the Recamán transform.at n=45A117073
• Number at end of segment n of A117073.at n=14A117075
• Numbers n such that n+(n+1), n^2+(n+1)^2, n+(n+1)^2, n^2+(n+1) are all prime.at n=38A216270
• Irregular triangle read by rows: T(n,k) is the number of distinct tilings by squares of an n X n square lattice that contain k nodes unconnected to any of their neighbors.at n=66A226997
• a(n) = a(n-1) + p(n) if p(n) > a(n-1), otherwise a(n) = a(n-1) - p(n), where p is the partition function A000041 (assuming a(n) = 0 for n < 0).at n=37A331165
• Maximum number of copies of a 12345 permutation pattern in an alternating (or zig-zag) permutation of length n + 7.at n=18A339355
• Number of king permutations on n elements avoiding the mesh pattern (12, {(0,1),(0,2),(1,0),(2,0)}).at n=9A383040