-6159

Appears in sequences

• a(n) = IntegerPart(PolyGamma(n, 3)).at n=13A144169
• Array of coefficients a(k,n) of the formal power series A(k,x) read by upwards antidiagonals, where A(k,x) = ((2*k+1)*x+sqrt(1+4*k*(k+1)*x^2))/(1-x^2), k>=0.at n=70A277930