81501

Appears in sequences

• Expansion of Product_{n>=1} (1 - x^(6*n))/(1 - x^n)^6 in powers of x.at n=10A277283
• Number of idempotent binary relation matrices E on [n] such that E contains an identity matrix of order n-1 and (E - I_n)^2 = 0.at n=6A360743