42608

Appears in sequences

• Partial sums of (A006899, prefixed by a 1).at n=23A170804
• 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=33A391452