31881

Appears in sequences

• Triangle: Number of asymmetric semigroups of order n with k idempotents.at n=26A058113
• Number of polyominoes with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.at n=12A075201
• Number of binary words of length n containing at least one subword 10^{8}1 and no subwords 10^{i}1 with i<8.at n=54A143288
• T(n,k)=Number of nXk arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns.at n=30A221890
• Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns.at n=5A221892
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 249", based on the 5-celled von Neumann neighborhood.at n=34A271014
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 785", based on the 5-celled von Neumann neighborhood.at n=32A273559
• Array read by antidiagonals upwards where A(n, k) is the number of non-isomorphic multiset partitions of weight n with k levels of brackets.at n=49A306186
• G.f. A(x) satisfies A(x) = 1 / (1 - x * A(x^4)).at n=35A367794