Number of compositions of 7*n-1 into parts 6 and 7.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =17a(8) =54a(9) =175a(10) =506a(11) =1299a(12) =3017a(13) =6465a(14) =13021a(15) =25142a(16) =47651a(17) =91104a(18) =180254a(19) =374077a(20) =810381a(21) =1800140a(22) =4019204a(23) =8888489a(24) =19322901a(25) =41223071a(26) =86520282a(27) =179574728a(28) =370946309a(29) =767426451