Number of compositions of n with no part divisible by the next or the prior.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =1a(7) =6a(8) =4a(9) =8a(10) =14a(11) =14a(12) =27a(13) =30a(14) =55a(15) =69a(16) =97a(17) =155a(18) =200a(19) =312a(20) =421a(21) =630a(22) =893a(23) =1260a(24) =1864a(25) =2600a(26) =3813a(27) =5395a(28) =7801a(29) =11196