24792

Appears in sequences

• Number of edges in the Hasse diagram of the poset of conjugacy classes of subgroups of the alternating group.at n=13A218926
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units without partitioning a triangle into 3 element sets of trapezoids.at n=29A391452