Number of compositions of 7*n into parts 5 and 7.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =9a(7) =37a(8) =121a(9) =331a(10) =794a(11) =1732a(12) =3553a(13) =7116a(14) =14501a(15) =31078a(16) =70607a(17) =166922a(18) =399315a(19) =946121a(20) =2197582a(21) =4998597a(22) =11188280a(23) =24835641a(24) =55117511a(25) =123036293a(26) =276976136a(27) =628285812a(28) =1431723937a(29) =3265884047