Number of compositions of n such that the least part occurs with odd multiplicity.

Terms

a(0) =1a(1) =1a(2) =4a(3) =3a(4) =13a(5) =16a(6) =41a(7) =64a(8) =154a(9) =261a(10) =560a(11) =1049a(12) =2176a(13) =4169a(14) =8474a(15) =16614a(16) =33477a(17) =66178a(18) =132776a(19) =263969a(20) =528519a(21) =1053483a(22) =2107772a(23) =4207680a(24) =8415341a(25) =16812773a(26) =33622527a(27) =67203682a(28) =134391649a(29) =268686218