Row sums of triangle A060556.

Terms

a(0) =1a(1) =3a(2) =10a(3) =33a(4) =108a(5) =352a(6) =1145a(7) =3721a(8) =12087a(9) =39254a(10) =127469a(11) =413908a(12) =1343980a(13) =4363921a(14) =14169633a(15) =46008619a(16) =149389218a(17) =485064009a(18) =1574993356a(19) =5113971944a(20) =16604963593a(21) =53915979657a(22) =175064088671