210150

Appears in sequences

• Number of binary strings of length n with equal numbers of 00010 and 11011 substrings.at n=19A164226
• 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 with a trapezoid filled by 3 trapezoids.at n=46A391204