Number of cyclic compositions of 2*n into odd parts.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =14a(5) =30a(6) =63a(7) =142a(8) =328a(9) =765a(10) =1810a(11) =4340a(12) =10461a(13) =25414a(14) =62074a(15) =152287a(16) =375166a(17) =927554a(18) =2300347a(19) =5721044a(20) =14264308a(21) =35646311a(22) =89264834a(23) =223959710a(24) =562878429a(25) =1416953362a(26) =3572233420a(27) =9018211989a(28) =22795835726a(29) =57690911720