37850

Appears in sequences

• Thickened pyramidal numbers: a(n) = 2*(n+1)*n + Sum_{i=1..n} (4*i*(i-1) + 1).at n=30A050533
• Expansion of q * (chi(-q) * chi(-q^5))^-4 in powers of q where chi() is a Ramanujan theta function.at n=16A093831
• Number of terms k such that difference between halving and tripling steps in Collatz (3x+1) trajectory of k is n.at n=27A213678
• a(n) = Sum_{k=1..n-1} k*A088459(n, k).at n=7A301566
• Number of compositions (ordered partitions) of n into square pyramidal numbers (A000330).at n=39A322340