OFFSET
1,2
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..17
V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p. 73.
EXAMPLE
Neighbors for n=4 (dots represent spaces):
.\|/\|/\|/\|/
. o..o..o..o
./|\/|\/|\/|\
.\|/\|/\|/\|/
. o..o..o..o
./|\/|\/|\/|\
.\|/\|/\|/\|/
. o..o..o..o
./|\/|\/|\/|\
.\|/\|/\|/\|/
. o..o..o..o
./|\/|\/|\/|\
CROSSREFS
Cf. circle A000204, line A000045, arrays: ne-sw nw-se A067965, e-w ne-sw nw-se A067963, n-s nw-se A067964, e-w n-s nw-se A066864, e-w ne-sw n-s nw-se A063443, n-s A067966, e-w n-s A006506, nw-se A067962, toruses: bare A002416, ne-sw nw-se A067960, e-w ne-sw n-s nw-se A067958, n-s A067961, e-w n-s A027683, e-w ne-sw n-s A066866.
KEYWORD
nonn,hard
AUTHOR
R. H. Hardin, Feb 02 2002
EXTENSIONS
a(13) from Vaclav Kotesovec, Aug 22 2016
a(14) from Vaclav Kotesovec, May 24 2021
a(15) from Sean A. Irvine, Jan 14 2024
STATUS
approved