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A332430 a(n) = floor(2^n/(1 - cos(1/n))). 4
4, 32, 145, 514, 1605, 4618, 12565, 32810, 83029, 204970, 495957, 1180330, 2770261, 6425259, 14751062, 33565356, 75781465, 169913009, 378623329, 839035584, 1850037628, 4060785394, 8876545497, 19330149277, 41948632852, 90742369765, 195711818579, 420951537104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

FORMULA

a(n) = floor(2^n/(1 - cos(1/n))).

MATHEMATICA

z = 50; u = Table[Floor[2^n/(1 - Cos[1/n])], {n, 1, z}]    (* A332430 *)

v = Table[Floor[2^n/(-1 + Cot[1/n])], {n, 1, z}]  (* A332431 *)

u - v   (* A332432 *)

w = Table[Floor[2^n/(1 - Cos[1/n]) - 2^n/(-1 + Cot[1/n])], {n, 1, z}]

u - v - w  (* A332479 *)

CROSSREFS

Cf. A333186, A332431, A332432, A332433, A332479.

Sequence in context: A088802 A123854 A301843 * A302070 A302267 A113154

Adjacent sequences:  A332427 A332428 A332429 * A332431 A332432 A332433

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Apr 04 2020

STATUS

approved

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Last modified January 27 22:42 EST 2022. Contains 350654 sequences. (Running on oeis4.)