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 A206224 Floor(n^2/4) appears 1+floor(n/2) times. 0
 0, 0, 1, 1, 2, 2, 4, 4, 4, 6, 6, 6, 9, 9, 9, 9, 12, 12, 12, 12, 16, 16, 16, 16, 16, 20, 20, 20, 20, 20, 25, 25, 25, 25, 25, 25, 30, 30, 30, 30, 30, 30, 36, 36, 36, 36, 36, 36, 36, 42, 42, 42, 42, 42, 42, 42, 49, 49, 49, 49, 49, 49, 49, 49, 56, 56, 56, 56, 56 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS FORMULA a(n) = floor((1/4)*(floor(sqrt(4*n+1))-1)^2)      = A002620(A055086(n))      = A002620(A000267(n)-1) MAPLE seq(floor((1/4)*(floor(sqrt(4*k+1))-1)^2), k=0..50) MATHEMATICA Flatten[Table[Table[Floor[n^2/4], {1 + Floor[n/2]}], {n, 0, 20}]] (* T. D. Noe, Feb 07 2012 *) CROSSREFS Cf. A002620, A055086, A000267. Sequence in context: A157887 A085237 A110870 * A035114 A202103 A062570 Adjacent sequences:  A206221 A206222 A206223 * A206225 A206226 A206227 KEYWORD nonn AUTHOR Mircea Merca, Feb 05 2012 STATUS approved

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