Shifts 4 places right under inverse binomial transform.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =7a(6) =23a(7) =65a(8) =165a(9) =398a(10) =976a(11) =2618a(12) =7997a(13) =27205a(14) =97705a(15) =355631a(16) =1289746a(17) =4662069a(18) =16971775a(19) =63150385a(20) =243513801a(21) =980670052a(22) =4121324752a(23) =17941655332a(24) =80143362633a(25) =364476958473