E.g.f.: S(x,y) = (sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), where S(x,y) = Sum_{n>=0} Sum_{k=0..2*n+1} T(n,k) * x^(2*n+1-k)*y^k/(2*n+1)!, as a triangle of coefficients T(n,k) read by rows.

A322622

E.g.f.: S(x,y) = (sinh(x) + sinh(y)) / (1 - sinh(x)*sinh(y)), where S(x,y) = Sum_{n>=0} Sum_{k=0..2*n+1} T(n,k) * x^(2*n+1-k)*y^k/(2*n+1)!, as a triangle of coefficients T(n,k) read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =6a(4) =6a(5) =1a(6) =1a(7) =40a(8) =140a(9) =140a(10) =40a(11) =1a(12) =1a(13) =224a(14) =2562a(15) =7000a(16) =7000a(17) =2562a(18) =224a(19) =1a(20) =1a(21) =1152a(22) =39384a(23) =260736a(24) =605808a(25) =605808a(26) =260736a(27) =39384a(28) =1152a(29) =1

External references