Number of compositions of n in which at most one part has even multiplicity.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =26a(7) =64a(8) =107a(9) =226a(10) =382a(11) =859a(12) =1488a(13) =3124a(14) =5628a(15) =11326a(16) =21629a(17) =42274a(18) =81420a(19) =158002a(20) =309129a(21) =592798a(22) =1181109a(23) =2234319a(24) =4501108a(25) =8461706a(26) =17211219a(27) =32187953a(28) =66018320a(29) =122792362