68726

Appears in sequences

• Next-to-central column of triangle in A059317.at n=12A106053
• Numbers k such that 2*F(k) + 1 is a prime, where F = A000045.at n=54A124067
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, -1), (1, 0, -1), (1, 1, 0)}.at n=10A148754
• 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 formed by directly binary space partitioning 3-trapezoid sets without forming 4-trapezoid sets.at n=50A391203