A335413 Irregular table read by rows: T(n,k) = number of k-sided polygons formed by n-secting the angles of an equilateral triangle for k >= 3.

1, 6, 12, 3, 3, 1, 24, 6, 36, 9, 9, 7, 48, 24, 6, 72, 21, 15, 19, 84, 48, 12, 6, 108, 51, 33, 25, 126, 90, 12, 6, 168, 69, 51, 43, 180, 120, 48, 18, 216, 123, 81, 49, 240, 180, 54, 36, 288, 171, 99, 73, 312, 234, 84, 48, 372, 225, 117, 103, 396, 288, 126, 60

Offset

1,2

Comments

See A277402 for illustrations.

Links

Lars Blomberg, Table of n, a(n) for n = 1..1991

Example

Table begins:
1;
6;
12, 3, 3, 1;
24, 6;
36, 9, 9, 7;
48, 24, 6;
72, 21, 15, 19;
84, 48, 12, 6;
108, 51, 33, 25;
126, 90, 12, 6;
168, 69, 51, 43;
180, 120, 48, 18;
216, 123, 81, 49;
240, 180, 54, 36;
288, 171, 99, 73;
312, 234, 84, 48;

Crossrefs

Cf. A277402 (regions), A335411 (vertices), A335412 (edges).

Sequence in context: A110645 A064913 A066401 * A356119 A263538 A076590

Adjacent sequences: A335410 A335411 A335412 * A335414 A335415 A335416

Keyword

nonn,tabf

Author

Lars Blomberg, Jun 08 2020

Status

approved