A227391 a(n) = round(3*(4/3)^n).

3, 4, 5, 7, 9, 13, 17, 22, 30, 40, 53, 71, 95, 126, 168, 224, 299, 399, 532, 710, 946, 1261, 1682, 2242, 2990, 3986, 5315, 7087, 9449, 12599, 16799, 22399, 29865, 39820, 53093, 70791, 94388, 125850, 167800, 223734, 298312, 397749, 530332, 707110, 942813

Offset

0,1

Comments

a(n) is the nearest integer of perimeter of Koch snowflake after n-th iterations with the original equilateral triangle has sides length s = 1.

Links

Table of n, a(n) for n=0..44.

Kival Ngaokrajang, Illustration for n = 0..5

Wikipedia, Koch snowflake

Mathematica

Table[Round[3*(4/3)^n], {n, 0, 50}] (* T. D. Noe, Jul 14 2013 *)

Crossrefs

Sequence in context: A346986 A167159 A226918 * A209721 A164572 A067530

Adjacent sequences: A227388 A227389 A227390 * A227392 A227393 A227394

Keyword

nonn

Author

Kival Ngaokrajang, Jul 10 2013

Status

approved