OFFSET
1,3
COMMENTS
Permuting the symbols will not change the structure.
REFERENCES
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,10,-10,-31,31,30,-30).
FORMULA
a(2n-1) = a(2n) = A056272(n). [R. J. Mathar, Nov 24 2010]
G.f.: -x*(19*x^6-24*x^4+9*x^2-1) / ((x-1)*(2*x^2-1)*(3*x^2-1)*(5*x^2-1)). [Colin Barker, Dec 05 2012]
MATHEMATICA
LinearRecurrence[{1, 10, -10, -31, 31, 30, -30}, {1, 1, 2, 2, 5, 5, 15}, 40] (* Harvey P. Dale, Dec 16 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved