A240734 - OEIS

A240734

Floor(6^n/(2+sqrt(5))^n).

1, 1, 2, 2, 4, 5, 8, 11, 16, 22, 32, 46, 65, 92, 130, 185, 262, 371, 526, 745, 1056, 1496, 2119, 3001, 4251, 6021, 8528, 12080, 17110, 24236, 34328, 48622, 68869, 97547, 138166, 195700, 277191, 392616, 556104, 787670, 1115663, 1580234, 2238256, 3170284

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

a(n) is the perimeter (rounded down) of a decaflake after n iterations, let a(0) = 1. The total number of sides is 10*A000400(n). The total number of holes is A002275(n). 2 + sqrt(5) = A098317.

LINKS

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

Kival Ngaokrajang, Illustration of decaflake for n = 0..3

Wikipedia, n-flake

MAPLE

A240734:=n->floor(6^n/(2+sqrt(5))^n); seq(A240734(n), n=0..50); # Wesley Ivan Hurt, Apr 12 2014

MATHEMATICA

Table[Floor[6^n/(2 + Sqrt[5])^n], {n, 0, 50}] (* Wesley Ivan Hurt, Apr 12 2014 *)

PROG

(PARI) {a(n)=floor(6^n/(2+sqrt(5))^n)}

for (n=0, 100, print1(a(n), ", "))

CROSSREFS

Cf. A000400, A002275, A098317, A240523 (pentaflake), A240671 (heptaflake), A240572 (octaflake), A240733 (nonaflake), A240734 (decaflake), A240735 (dodecaflake).

Sequence in context: A371840 A089299 A017910 * A328460 A238478 A013979

Adjacent sequences: A240731 A240732 A240733 * A240735 A240736 A240737

KEYWORD

nonn,easy

AUTHOR

Kival Ngaokrajang, Apr 11 2014

STATUS

approved