a(n) = Sum_{k=0..floor(n/2)} A026637(n, k).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =14a(5) =21a(6) =55a(7) =85a(8) =216a(9) =341a(10) =848a(11) =1365a(12) =3340a(13) =5461a(14) =13191a(15) =21845a(16) =52208a(17) =87381a(18) =206968a(19) =349525a(20) =821514a(21) =1398101a(22) =3264044a(23) =5592405a(24) =12979006a(25) =22369621a(26) =51642594a(27) =89478485a(28) =205592744a(29) =357913941