Number of compositions of the integer n in which the first part is >= the other parts.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =14a(7) =24a(8) =43a(9) =77a(10) =140a(11) =256a(12) =472a(13) =874a(14) =1628a(15) =3045a(16) =5719a(17) =10780a(18) =20388a(19) =38674a(20) =73562a(21) =140268a(22) =268066a(23) =513350a(24) =984911a(25) =1892875a(26) =3643570a(27) =7023562a(28) =13557020a(29) =26200182