Number of compositions of 6*n-5 into parts 1 and 6.

Terms

a(0) =1a(1) =3a(2) =12a(3) =55a(4) =251a(5) =1133a(6) =5103a(7) =22990a(8) =103598a(9) =466852a(10) =2103796a(11) =9480387a(12) =42721676a(13) =192517665a(14) =867546829a(15) =3909446467a(16) =17617229520a(17) =79388930909a(18) =357752184782