250200

Appears in sequences

• Coordination sequence for D_4 lattice.at n=25A007900
• Number T(n,k) of set partitions of [n] where each subset is again partitioned into k nonempty subsets; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=58A324162
• Number of set partitions of [n] where each subset is again partitioned into three nonempty subsets.at n=10A327504
• a(n) = pos(M(n)), where M(n) is the n X n circulant matrix with (row 1) = (1,3,5,7, ..., 2n - 1), and pos(M(n)) is the positive part of the determinant of M(n); see A380661.at n=4A384076
• a(n) = pos(M(n)), where M(n) is the n X n left circulant matrix with (row 1) = (1,3,5,7, ..., 2n - 1), and pos(M(n)) is the positive part of the determinant of M(n); see A380661.at n=4A384078