A172474 a(n) = floor(n*sqrt(2)/4).

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

Offset: 0

Author

Vincenzo Librandi, Feb 04 2010

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A022842: floor(n/(sqrt(2)/4)).

Programs

Magma

[Floor(n*Sqrt(2)/4): n in [0..80]]; // Vincenzo Librandi, Aug 01 2013

Maple

a:=n->floor(n*sqrt(2)/4): seq(a(n),n=0..80); # Muniru A Asiru, Sep 28 2018

Mathematica

Table[Floor[n Sqrt[2]/4], {n, 0, 80}] (* Vincenzo Librandi, Aug 01 2013 *)

PARI

vector(80, n, n--; floor(n*sqrt(2)/4)) \\ G. C. Greubel, Sep 28 2018