Number of compositions of n in which the least part is odd.

Terms

a(0) =1a(1) =1a(2) =4a(3) =6a(4) =14a(5) =28a(6) =59a(7) =117a(8) =239a(9) =484a(10) =980a(11) =1973a(12) =3973a(13) =7989a(14) =16054a(15) =32227a(16) =64653a(17) =129628a(18) =259787a(19) =520440a(20) =1042305a(21) =2086938a(22) =4177680a(23) =8361557a(24) =16733221a(25) =33482909a(26) =66992641a(27) =134028938a(28) =268128902a(29) =536373288