Number of compositions of 7*n into parts 6 and 7.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =9a(8) =37a(9) =121a(10) =331a(11) =793a(12) =1718a(13) =3448a(14) =6556a(15) =12121a(16) =22509a(17) =43453a(18) =89150a(19) =193823a(20) =436304a(21) =989759a(22) =2219064a(23) =4869285a(24) =10434412a(25) =21900170a(26) =45297211a(27) =93054446a(28) =191371581a(29) =396480142