a(n) is the number of occurrences of 7's in the palindromic compositions of 2*n-1, or also, the number of occurrences of 8's in the palindromic compositions of 2*n.
A079861
a(n) is the number of occurrences of 7's in the palindromic compositions of 2*n-1, or also, the number of occurrences of 8's in the palindromic compositions of 2*n.
Terms
- a(0) =10a(1) =22a(2) =48a(3) =104a(4) =224a(5) =480a(6) =1024a(7) =2176a(8) =4608a(9) =9728a(10) =20480a(11) =43008a(12) =90112a(13) =188416a(14) =393216a(15) =819200a(16) =1703936a(17) =3538944a(18) =7340032a(19) =15204352a(20) =31457280a(21) =65011712a(22) =134217728a(23) =276824064a(24) =570425344a(25) =1174405120a(26) =2415919104a(27) =4966055936
External references
- oeis: A079861