Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/3) * (1 / (exp(x) + exp(y) - exp(x+y))^3 - 1).
A382741
Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/3) * (1 / (exp(x) + exp(y) - exp(x+y))^3 - 1).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =9a(5) =1a(6) =1a(7) =25a(8) =25a(9) =1a(10) =1a(11) =57a(12) =193a(13) =57a(14) =1a(15) =1a(16) =121a(17) =889a(18) =889a(19) =121a(20) =1a(21) =1a(22) =249a(23) =3361a(24) =7593a(25) =3361a(26) =249a(27) =1a(28) =1a(29) =505
External references
- oeis: A382741