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%I A018068 #17 Dec 29 2020 02:51:41
%S A018068 1,2,3,5,8,14,23,39,64,108,182,305,512,862,1449,2436,4096,6889,11586,
%T A018068 19484,32768,55109,92682,155872,262144,440872,741456,1246975,2097152,
%U A018068 3526976,5931642,9975793,16777216
%N A018068 Powers of fourth root of 8 rounded up.
%H A018068 Robert Israel, <a href="/A018068/b018068.txt">Table of n, a(n) for n = 0..4424</a>
%F A018068 a(n) = ceiling(8^(n/4)). - _Michel Marcus_, Dec 28 2020
%p A018068 seq(ceil(8^(n/4)),n=0..40); # _Robert Israel_, Dec 28 2020
%o A018068 (PARI) a(n) = n*=3; if(n%2,sqrtnint(1<<n,4)+1, n%4,sqrtint(1<<(n/2))+1, 1<<(n/4)); \\ _Kevin Ryde_, Dec 29 2020
%Y A018068 Cf. A001018 (powers of 8).
%K A018068 nonn
%O A018068 0,2
%A A018068 _N. J. A. Sloane_.

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