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 A008363 a(n) = floor(n/5)*ceiling(n/5). 0
 0, 0, 0, 0, 0, 1, 2, 2, 2, 2, 4, 6, 6, 6, 6, 9, 12, 12, 12, 12, 16, 20, 20, 20, 20, 25, 30, 30, 30, 30, 36, 42, 42, 42, 42, 49, 56, 56, 56, 56, 64, 72, 72, 72, 72, 81, 90, 90, 90, 90, 100, 110, 110, 110, 110, 121, 132, 132 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 LINKS FORMULA From R. J. Mathar, Mar 11 2012: (Start) a(n) = a(n-1) +2 a(n-5) -2 a(n-6) -a(n-10) +a(n-11). G.f.: x^5*(1+x)/((1-x)^3*(1+x+x^2+x^3+x^4)^2). (End) CROSSREFS Sequence in context: A216393 A045812 A064877 * A261611 A097198 A126663 Adjacent sequences:  A008360 A008361 A008362 * A008364 A008365 A008366 KEYWORD nonn AUTHOR STATUS approved

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Last modified August 24 22:41 EDT 2019. Contains 326314 sequences. (Running on oeis4.)