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%I #13 Sep 08 2022 08:44:44
%S 1,2,4,9,21,44,96,206,441,944,2020,4326,9261,19824,42439,90849,194481,
%T 416324,891223,1907838,4084101,8742815,18715701,40064612,85766121,
%U 183599118,393029741,841356858,1801088541,3855581491,8253624572,17668494033,37822859361
%N Powers of fourth root of 21 rounded down.
%H Vincenzo Librandi, <a href="/A018105/b018105.txt">Table of n, a(n) for n = 0..1000</a>
%F a(n) = floor((21)^(n/4)). - _Wesley Ivan Hurt_, Apr 24 2017
%p A018105:=n->floor((21)^(n/4)): seq(A018105(n), n=0..40); # _Wesley Ivan Hurt_, Apr 24 2017
%t Table[Floor[21^(n/4)], {n, 0, 30}] (* _Vincenzo Librandi_, Apr 25 2017 *)
%o (Magma) [Floor(21^(n/4)) : n in [0..40]]; // _Vincenzo Librandi_, Apr 25 2017
%Y Cf. A011017 (fourth root of 21).
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_
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