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 A172474 a(n) = floor(n*sqrt(2)/4). 1
 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 24, 24, 24, 25, 25, 25, 26, 26 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 MATHEMATICA Table[Floor[n Sqrt[2]/4], {n, 0, 80}] (* Vincenzo Librandi, Aug 01 2013 *) PROG (MAGMA) [Floor(n*Sqrt(2)/4): n in [0..80]]; // Vincenzo Librandi, Aug 01 2013 CROSSREFS Cf. A022842: floor(n/(sqrt(2)/4)). Sequence in context: A194990 A231153 A099199 * A062276 A053264 A079440 Adjacent sequences:  A172471 A172472 A172473 * A172475 A172476 A172477 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Feb 04 2010 STATUS approved

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Last modified November 24 01:09 EST 2014. Contains 249867 sequences.