OFFSET
0,2
REFERENCES
R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 6.28(c), y_5.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1, 2, 0, -2, -4, 1, 3, 3, 1, -4, -2, 0, 2, 1, -1).
MATHEMATICA
CoefficientList[Series[(1 + 4 x + 14 x^2 + 34 x^3 + 63 x^4 + 80 x^5 + 87 x^6 + 68 x^7 + 42 x^8 + 20 x^9 + 7 x^10) / ((1 - x) (1 - x^2)^2 (1 - x^3)^2 (1 - x^4)), {x, 0, 40}], x] (* Vincenzo Librandi, Aug 28 2016 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 05 2000
STATUS
approved