a(i) = the number of occurrences of 9's in the palindromic compositions of n=2*i-1 = the number of occurrences of 10's in the palindromic compositions of n=2*i.

A079862

a(i) = the number of occurrences of 9's in the palindromic compositions of n=2*i-1 = the number of occurrences of 10's in the palindromic compositions of n=2*i.

Terms

    a(0) =18a(1) =38a(2) =80a(3) =168a(4) =352a(5) =736a(6) =1536a(7) =3200a(8) =6656a(9) =13824a(10) =28672a(11) =59392a(12) =122880a(13) =253952a(14) =524288a(15) =1081344a(16) =2228224a(17) =4587520a(18) =9437184a(19) =19398656a(20) =39845888a(21) =81788928a(22) =167772160a(23) =343932928a(24) =704643072a(25) =1442840576a(26) =2952790016a(27) =6039797760a(28) =12348030976a(29) =25232932864

External references