Logarithmic derivative of A180718.

Terms

a(0) =1a(1) =5a(2) =16a(3) =61a(4) =226a(5) =884a(6) =3543a(7) =14429a(8) =59623a(9) =248950a(10) =1049159a(11) =4454356a(12) =19032976a(13) =81769735a(14) =352967821a(15) =1529948477a(16) =6655903632a(17) =29050257899a(18) =127162016206a(19) =558088733406