a(n) = [x^n*y^n/(2*n)!] = (cosh(x)*cosh(y) + sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), for n >= 0.
A322624
a(n) = [x^n*y^n/(2*n)!] = (cosh(x)*cosh(y) + sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), for n >= 0.
Terms
- a(0) =1a(1) =2a(2) =30a(3) =1040a(4) =68390a(5) =7322112a(6) =1161583500a(7) =256124504064
External references
- oeis: A322624