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A330851 The number of edges inside a cross with width 3 and height n (see Comments in A331455 for definition) formed by the straight line segments mutually connecting all vertices and all points. 4
108, 172, 294, 522, 848, 1352, 2046, 3032, 4260, 5958, 8048, 10806, 14082, 18070, 22778, 28646, 35314, 43436, 52676, 63370, 75290, 89330, 104908, 122816, 142476, 164644, 188954, 216686, 246584, 280386, 317186, 357658, 401138, 448884, 500014, 556706, 617160 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

See the links in A331455 for images of the crosses.

LINKS

Lars Blomberg, Table of n, a(n) for n = 2..50

CROSSREFS

Cf. A331455 (regions), A330848 (n-gons), A330850 (vertices), A333035 (cross with equal length arms).

Sequence in context: A274118 A046294 A039601 * A245032 A208088 A323548

Adjacent sequences:  A330848 A330849 A330850 * A330852 A330853 A330854

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

Corrected offset and a(11) and beyond from Lars Blomberg, May 31 2020

STATUS

approved

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Last modified June 13 15:33 EDT 2021. Contains 345008 sequences. (Running on oeis4.)