OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (34,-423,2286,-4536)
FORMULA
a(n) = 21*a(n-1) - 108*a(n-2) + 7^(n+1) - 6^(n+1), n >= 2. - Vincenzo Librandi, Mar 13 2011
a(n) = 7^(n+3)/10 - 9^(n+2)/2 - 2*6^(n+1) + 8*12^(n+1)/5. - R. J. Mathar, Mar 18 2011
MATHEMATICA
CoefficientList[Series[1/((1-6x)(1-7x)(1-9x)(1-12x)), {x, 0, 20}], x] (* or *) LinearRecurrence[{34, -423, 2286, -4536}, {1, 34, 733, 12826}, 20] (* Harvey P. Dale, Dec 11 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved