A transform of the central binomial coefficients A001405.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =11a(6) =21a(7) =39a(8) =74a(9) =141a(10) =271a(11) =521a(12) =1004a(13) =1939a(14) =3756a(15) =7291a(16) =14176a(17) =27599a(18) =53805a(19) =105031a(20) =205268a(21) =401573a(22) =786328a(23) =1541037a(24) =3022528a(25) =5932657a(26) =11652617a(27) =22901865a(28) =45037432a(29) =88616807