Binomial transform of A001371.

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =26a(5) =62a(6) =157a(7) =409a(8) =1079a(9) =2863a(10) =7617a(11) =20299a(12) =54202a(13) =145134a(14) =390048a(15) =1052840a(16) =2855633a(17) =7784909a(18) =21333806a(19) =58769738a(20) =162735221a(21) =452890963a(22) =1266501060a(23) =3558037366a(24) =10038873751a(25) =28437746721a(26) =80854303650a(27) =230659891380