38703

Appears in sequences

• Semiorders on n elements.at n=6A006531
• Number of inequivalent ways (mod D_4) a pair of checkers can be placed on an n X n board.at n=27A014409
• a(n) = number of ways to dispose two pawns on a chessboard of size n X n (two dispositions are equivalent if one can be rotated or reflected to give the other one).at n=28A141582
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 461", based on the 5-celled von Neumann neighborhood.at n=37A272293
• a(n-5) is the number of nonempty subsets of {1,2,...,n} such that the difference of successive elements is at least 5.at n=31A330910
• Numbers that can be represented in more than one way as p^2+p*q+q^2 with p and q primes, p<=q.at n=30A349987