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A056865 a(n) = floor(n^2/10). 4
0, 0, 0, 0, 1, 2, 3, 4, 6, 8, 10, 12, 14, 16, 19, 22, 25, 28, 32, 36, 40, 44, 48, 52, 57, 62, 67, 72, 78, 84, 90, 96, 102, 108, 115, 122, 129, 136, 144, 152, 160, 168, 176, 184, 193, 202, 211, 220, 230, 240, 250, 260, 270, 280, 291, 302, 313, 324 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..57.

Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,0,0,0,1,-2,1).

FORMULA

G.f.: -x^4*(1+x^4) / ( (1+x)*(x^4-x^3+x^2-x+1)*(x^4+x^3+x^2+x+1)*(x-1)^3 ). - R. J. Mathar, Mar 08 2016

MAPLE

A056865 := proc(n)

    floor(n^2/10) ;

end proc:

seq(A056865(n), n=0..100) ; # R. J. Mathar, Mar 08 2016

PROG

(PARI) a(n) = n^2\10; \\ Michel Marcus, Mar 08 2016

CROSSREFS

Cf. A056864.

Sequence in context: A203812 A047894 A113769 * A097602 A126794 A011862

Adjacent sequences:  A056862 A056863 A056864 * A056866 A056867 A056868

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Sep 02 2000

STATUS

approved

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Last modified March 23 10:55 EDT 2019. Contains 321424 sequences. (Running on oeis4.)