OFFSET
1,5
REFERENCES
L. Ericson et al., Enumeration of tree properties..., Algorithms Review, 1 (1990), 119-124.
LINKS
Index entries for linear recurrences with constant coefficients, signature (15,-90,270,-405,243).
FORMULA
G.f.: x^4*(15*x+1)/(1-3*x)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009]
a(1)=0, a(2)=0, a(3)=0, a(4)=1, a(5)=30, a(n)=15*a(n-1)-90*a(n-2)+ 270*a(n-3)- 405*a(n-4)+243*a(n-5). - Harvey P. Dale, May 15 2015
MATHEMATICA
Table[((n-1)(n-2)(n-3)(3n-10)3^(n-5))/4, {n, 30}] (* or *) LinearRecurrence[ {15, -90, 270, -405, 243}, {0, 0, 0, 1, 30}, 30] (* Harvey P. Dale, May 15 2015 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Sep 16 2003
EXTENSIONS
G.f. proposed by Maksym Voznyy checked and corrected by R. J. Mathar, Sep 16 2009.
Definition clarified by Harvey P. Dale, May 15 2015
STATUS
approved