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a(n) = ceiling(n*phi^4), where phi is the golden ratio, A001622.
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%I #15 Sep 25 2019 15:10:40

%S 0,7,14,21,28,35,42,48,55,62,69,76,83,90,96,103,110,117,124,131,138,

%T 144,151,158,165,172,179,186,192,199,206,213,220,227,234,240,247,254,

%U 261,268,275,282,288,295,302,309

%N a(n) = ceiling(n*phi^4), where phi is the golden ratio, A001622.

%H Robert Israel, <a href="/A004959/b004959.txt">Table of n, a(n) for n = 0..10000</a>

%F a(n) = A004956(3*n)+2*n. - _Robert Israel_, Sep 25 2019

%p phi:= (sqrt(5)+1)/2:

%p seq(ceil(3*n*phi)+2*n, n=0..100); # _Robert Israel_, Sep 25 2019

%t With[{c=GoldenRatio^4},Ceiling[c*Range[0,50]]] (* _Harvey P. Dale_, Oct 04 2015 *)

%Y Cf. A001622, A004956.

%K nonn

%O 0,2

%A _N. J. A. Sloane_