Number of collapsible integer compositions of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =2a(4) =5a(5) =2a(6) =12a(7) =2a(8) =26a(9) =9a(10) =36a(11) =2a(12) =206a(13) =2a(14) =132a(15) =40a(16) =677a(17) =2a(18) =1746a(19) =2a(20) =3398a(21) =136a(22) =2052a(23) =2a(24) =44388a(25) =33a(26) =8196a(27) =730a(28) =79166a(29) =2