G.f.: A(x,y) = exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^3*y^k] * x^n/n ) = Sum_{n>=0,k=0..n} T(n,k)*x^n*y^k, as a triangle of coefficients T(n,k) read by rows.
A181143
G.f.: A(x,y) = exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^3*y^k] * x^n/n ) = Sum_{n>=0,k=0..n} T(n,k)*x^n*y^k, as a triangle of coefficients T(n,k) read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =14a(8) =14a(9) =1a(10) =1a(11) =30a(12) =85a(13) =30a(14) =1a(15) =1a(16) =55a(17) =337a(18) =337a(19) =55a(20) =1a(21) =1a(22) =91a(23) =1029a(24) =2230a(25) =1029a(26) =91a(27) =1a(28) =1a(29) =140
External references
- oeis: A181143