35075

Appears in sequences

• Number of 3-element proper antichains (i.e., antichains such that every two members have nonempty intersection) on an unlabeled n-element set.at n=17A056782
• The odd edge of a primitive 3-simplex (0, b=A031173, c=A031174, d=A031175).at n=38A298047
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x + 529)^2 = y^2.at n=14A309998
• a(n) = 2*n^3 - 3*n + 1.at n=26A377663