A247179 - OEIS

A247179

Floor of area enclosed in the interior of n unit circles arranged in a circle.

0, 0, 2, 4, 6, 9, 13, 18, 23, 29, 35, 42, 50, 58, 67, 76, 87, 98, 109, 121, 134, 147, 161, 176, 191, 207, 224, 241, 259, 277, 296, 316, 337, 358, 379, 402, 424, 448, 472, 497, 523, 549, 575, 603, 631, 660, 689, 719, 749, 781, 812, 845, 878, 912, 946, 981, 1017, 1053, 1090

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

OFFSET

3,3

COMMENTS

See illustration in links.

LINKS

Table of n, a(n) for n=3..61.

Kival Ngaokrajang, Illustration of initial terms

FORMULA

a(n) = Floor((n/tan(Pi/n)) - Pi*((n/2)-1)).

PROG

(PARI)for (n=3, 100, print1(floor((n/tan(Pi/n))-Pi*((n/2)-1)), ", "))