40690

Appears in sequences

• Number of distributive lattices; also number of paths with n turns when light is reflected from 12 glass plates.at n=5A030116
• Ordered product of the sides of primitive Pythagorean triangles divided by 60.at n=33A081752
• Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v5, v2 <= v5, v2 <= v4 and v3 <= v4.at n=11A085461
• Number of nondecreasing -n..n vectors of length 3 whose dot product with some other -n..n vector equals 3.at n=31A226342
• Product_{n>=1} (1 + a(n) * x^n) = 1 + Sum_{n>=1} (n * (n + 1) / 2) * x^n.at n=32A359407