



0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21
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OFFSET

0,6


COMMENTS



LINKS



FORMULA

a(n) = ceiling(n/4).
a(n) = a(n1) + a(n4)  a(n5) for n>4.
G.f.: x/(x^5  x^4  x + 1). (End)


MAPLE



MATHEMATICA

CoefficientList[Series[x/(x^5  x^4  x + 1), {x, 0, 100}], x] (* Wesley Ivan Hurt, May 29 2016 *)
LinearRecurrence[{1, 0, 0, 1, 1}, {0, 1, 1, 1, 1}, 50] (* G. C. Greubel, May 29 2016 *)


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



