INVERT transform of A052879.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =16a(5) =54a(6) =197a(7) =746a(8) =2916a(9) =11650a(10) =47418a(11) =195794a(12) =818347a(13) =3455173a(14) =14715502a(15) =63143438a(16) =272721871a(17) =1184697735a(18) =5172610484a(19) =22687623448a(20) =99918182347a(21) =441676607009