A103948 a(n) is the number of distinct n-th powers of functions {1, 2, 3} -> {1, 2, 3}.

1, 27, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19, 12, 21, 10, 21, 12, 19

Offset

0,2

Links

Table of n, a(n) for n=0..69.

Index entries for linear recurrences with constant coefficients, signature (-1, 0, 1, 1).

Formula

For n > 1, a(n) = a(n+6).

G.f.: (6*x^5-3*x^4-30*x^3-39*x^2-28*x-1) / ((x-1)*(x+1)*(x^2+x+1)). - Colin Barker, Aug 07 2013

Mathematica

Join[{1, 27}, LinearRecurrence[{-1, 0, 1, 1}, {12, 19, 12, 21}, 68]] (* Ray Chandler, Sep 08 2015 *)

Crossrefs

Cf. A102687, A102709, A103947, A103949, A103950.

Row n=3 of A247026.

Sequence in context: A040706 A069893 A013681 * A323835 A040705 A317106

Adjacent sequences: A103945 A103946 A103947 * A103949 A103950 A103951

Keyword

easy,nonn

Author

David Wasserman, Feb 21 2005

Status

approved