OFFSET
1,1
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..100
Sergei Abramovich, Combinatorics of the Triangle Inequality: From Straws to Experimental Mathematics for Teachers, Spreadsheets in Education (eJSiE), Vol. 9, Issue 1, Article 1, 2016.
Index entries for linear recurrences with constant coefficients, signature (48,-675,2592,12393,-104976,177147).
FORMULA
G.f.: x*(10 - 180*x + 1755*x^2 - 3159*x^3 - 8748*x^4) / ((1 - 3*x) * (1 - 9*x)^2 * (1 - 27*x) * (1 - 27*x^2)). - Colin Barker, Nov 16 2016
MATHEMATICA
LinearRecurrence[{48, -675, 2592, 12393, -104976, 177147}, {10, 300, 9405, 271701, 7586055, 207778365}, 20] (* Harvey P. Dale, May 08 2018 *)
PROG
(PARI) Vec(x*(10-180*x+1755*x^2-3159*x^3-8748*x^4)/((1-3*x)*(1-9*x)^2*(1-27*x)*(1-27*x^2)) + O(x^30)) \\ Colin Barker, Nov 16 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Nov 14 2016
EXTENSIONS
More terms from Lars Blomberg, Nov 16 2016
STATUS
approved