105500

Appears in sequences

• a(n) = determinant of n X n circulant matrix whose first row is the first n triangular numbers A000217(0), A000217(1), ... A000217(n-1).at n=4A118705
• Number of peak-avoiding compositions with positive parts.at n=23A128768
• a(n) = coefficient of x^n*y^n in Product_{n>=1} (1 - (x^n + y^n))^3.at n=33A322214