Inverse Euler transform of the Riordan numbers, (A005043).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =5a(6) =11a(7) =28a(8) =68a(9) =174a(10) =445a(11) =1166a(12) =3068a(13) =8190a(14) =21994a(15) =59585a(16) =162360a(17) =445145a(18) =1226376a(19) =3394654a(20) =9434260a(21) =26317865a(22) =73661588a(23) =206809307a(24) =582255448a(25) =1643536725a(26) =4650250254a(27) =13186484316a(28) =37468566744a(29) =106666821221