Binomial transform of A004524 starting at 1.

Terms

a(0) =1a(1) =3a(2) =7a(3) =15a(4) =32a(5) =70a(6) =156a(7) =348a(8) =768a(9) =1672a(10) =3600a(11) =7696a(12) =16384a(13) =34784a(14) =73664a(15) =155584a(16) =327680a(17) =688256a(18) =1442048a(19) =3014912a(20) =6291456a(21) =13106688a(22) =27261952a(23) =56622080a(24) =117440512a(25) =243271680a(26) =503320576a(27) =1040191488a(28) =2147483648