OFFSET
1,1
COMMENTS
Sequence contains numbers of form (6+60k), (24+60k), (27+60k), (33+60k), with k>=0.
LINKS
Colin Barker, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (1,0,0,1,-1).
FORMULA
G.f.: x*(27*x^4+6*x^3+3*x^2+18*x+6) / (x^5-x^4-x+1). - Colin Barker, Jun 16 2013
a(n) = (-60 - 6*(-1)^n - (21-9*i)*(-i)^n - (21+9*i)*i^n + 60*n) / 4 where i=sqrt(-1). - Colin Barker, Oct 16 2015
PROG
(PARI) a(n) = (-60 - 6*(-1)^n - (21-9*I)*(-I)^n - (21+9*I)*I^n + 60*n) / 4 \\ Colin Barker, Oct 16 2015
(PARI) Vec(x*(27*x^4+6*x^3+3*x^2+18*x+6)/(x^5-x^4-x+1) + O(x^100)) \\ Colin Barker, Oct 16 2015
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Benoit Cloitre, Aug 07 2002
STATUS
approved