OFFSET
0,2
LINKS
Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081, 2014
Index entries for linear recurrences with constant coefficients, signature (4, -6, 4, -1).
FORMULA
a(n) = A027620(n-1), n>0.
G.f.: x(9-4x+x^2)/(1-x)^4. [From R. J. Mathar, Dec 10 2008]
MATHEMATICA
Table[n(n+2)^2, {n, 0, 60}] (* Vladimir Joseph Stephan Orlovsky, Apr 12 2011 *)
CoefficientList[Series[x (9-4x+x^2)/(1-x)^4, {x, 0, 50}], x] (* or *) LinearRecurrence[{4, -6, 4, -1}, {0, 9, 32, 75}, 50] (* Harvey P. Dale, Aug 25 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Dec 09 2008
STATUS
approved