Triangle read by rows: the coefficient [t^n x^k] of n!*(n+2)! *exp(x*t) *(t*(1-2*exp(t))-2*exp(t)) / (2*(1-exp(t))), in row n, k=0..n+1.
A176989
Triangle read by rows: the coefficient [t^n x^k] of n!*(n+2)! *exp(x*t) *(t*(1-2*exp(t))-2*exp(t)) / (2*(1-exp(t))), in row n, k=0..n+1.
Terms
- a(0) =2a(1) =2a(2) =5a(3) =6a(4) =3a(5) =2a(6) =40a(7) =24a(8) =8a(9) =-1a(10) =30a(11) =300a(12) =120a(13) =30a(14) =-12a(15) =-24a(16) =360a(17) =2400a(18) =720a(19) =144a(20) =20a(21) =-420a(22) =-420a(23) =4200a(24) =21000a(25) =5040a(26) =840a(27) =480a(28) =960a(29) =-10080
External references
- oeis: A176989