Binomial transform of A000960.

Terms

a(0) =1a(1) =4a(2) =14a(3) =44a(4) =126a(5) =338a(6) =870a(7) =2178a(8) =5338a(9) =12854a(10) =30486a(11) =71346a(12) =165004a(13) =377616a(14) =856226a(15) =1925952a(16) =4302602a(17) =9556668a(18) =21123352a(19) =46495132a(20) =101966972a(21) =222873154a(22) =485600018a(23) =1054774296a(24) =2284128920a(25) =4931542640a(26) =10616417010a(27) =22790442500a(28) =48794077242a(29) =104205354276