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A018068 Powers of fourth root of 8 rounded up. 1
1, 2, 3, 5, 8, 14, 23, 39, 64, 108, 182, 305, 512, 862, 1449, 2436, 4096, 6889, 11586, 19484, 32768, 55109, 92682, 155872, 262144, 440872, 741456, 1246975, 2097152, 3526976, 5931642, 9975793, 16777216 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Robert Israel, Table of n, a(n) for n = 0..4424

FORMULA

a(n) = ceiling(8^(n/4)). - Michel Marcus, Dec 28 2020

MAPLE

seq(ceil(8^(n/4)), n=0..40); # Robert Israel, Dec 28 2020

PROG

(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

CROSSREFS

Cf. A001018 (powers of 8).

Sequence in context: A094926 A225391 A078843 * A120400 A217283 A000621

Adjacent sequences:  A018065 A018066 A018067 * A018069 A018070 A018071

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 22 03:32 EST 2021. Contains 340360 sequences. (Running on oeis4.)