427350

Appears in sequences

• 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=23A024391
• a(n) = (binomial(2*n, n)^2 + binomial(2*n, n))/2.at n=6A037967
• Number of nonsquare rectangles on an n X n board.at n=35A052149
• Triangular numbers m such that A040115(m) is also triangular.at n=31A087597
• Number of ways of writing n as the sum of 10 triangular numbers from A000217.at n=31A226254