Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] exp(x+y) / (exp(x) + exp(y) - exp(x+y))^4.
A382674
Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] exp(x+y) / (exp(x) + exp(y) - exp(x+y))^4.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =13a(8) =13a(9) =1a(10) =1a(11) =29a(12) =77a(13) =29a(14) =1a(15) =1a(16) =61a(17) =325a(18) =325a(19) =61a(20) =1a(21) =1a(22) =125a(23) =1181a(24) =2357a(25) =1181a(26) =125a(27) =1a(28) =1a(29) =253
External references
- oeis: A382674