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A343177 a(0)=4; if n >0 is even then a(n) = 2^(n/2+1)+3, otherwise a(n) = 3*(2^((n-1)/2)+1). 0
4, 6, 7, 9, 11, 15, 19, 27, 35, 51, 67, 99, 131, 195, 259, 387, 515, 771, 1027, 1539, 2051, 3075, 4099, 6147, 8195, 12291, 16387, 24579, 32771, 49155, 65539, 98307, 131075, 196611, 262147, 393219, 524291, 786435, 1048579, 1572867, 2097155, 3145731, 4194307, 6291459 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Number of edges along the boundary of the graph G(n) described in A342759.

LINKS

Table of n, a(n) for n=0..43.

MAPLE

f:=n->if n = 0 then 4 elif (n mod 2) = 0 then 2^(n/2+1)+3 else 3*(2^((n-1)/2)+1); fi;

[seq(f(n), n=0..40)];

CROSSREFS

Cf. A342759.

Sequence in context: A193627 A256792 A345665 * A085817 A177688 A190250

Adjacent sequences:  A343174 A343175 A343176 * A343178 A343179 A343180

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 26 2021

STATUS

approved

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Last modified September 26 17:00 EDT 2021. Contains 347670 sequences. (Running on oeis4.)