Number of compositions of 7*n-3 into parts 1 and 7.

Terms

a(0) =1a(1) =6a(2) =28a(3) =133a(4) =651a(5) =3206a(6) =15771a(7) =77519a(8) =380989a(9) =1872556a(10) =9203761a(11) =45237262a(12) =222344668a(13) =1092840924a(14) =5371396171a(15) =26400821252a(16) =129762048116a(17) =637790353236