A330848 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A330848

Table read by rows: T(n,k) = number of k-sided polygons in a cross with width 3 and height n (see Comments in A331455 for definition) for k = 3,4,5

4

50, 14, 0, 84, 20, 0, 132, 42, 2, 188, 116, 0, 290, 202, 0, 428, 350, 0, 634, 542, 0, 890, 840, 2, 1290, 1156, 0, 1776, 1640, 0, 2392, 2220, 2, 3108, 3064, 0, 4112, 3946, 2, 5260, 5076, 4, 6696, 6350, 6, 8308, 8072, 8, 10334, 9886, 8, 12588, 12256, 8

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

OFFSET

1,1

COMMENTS

See the links in A331455 for images of the crosses.

LINKS

Lars Blomberg, Table of n, a(n) for n = 1..147 (the first 49 rows)

EXAMPLE

Table begins:

50, 14, 0

84, 20, 0

132, 42, 2

188, 116, 0

290, 202, 0

428, 350, 0

634, 542, 0

890, 840, 2

1290, 1156, 0

The row sums are A331455.

CROSSREFS

Cf. A331455 (regions), A330850 (vertices), A330851 (edges), A333037 (cross with equal length arms).

Sequence in context: A187697 A048178 A317619 * A072460 A248128 A033370

Adjacent sequences: A330845 A330846 A330847 * A330849 A330850 A330851

KEYWORD

nonn,tabf

AUTHOR

Scott R. Shannon and N. J. A. Sloane, Mar 07 2020

EXTENSIONS

a(28) and beyond from Lars Blomberg, May 31 2020

STATUS

approved