OFFSET
0,3
COMMENTS
See A274640 for further information.
Presumably every row, column, and diagonal is a permutation of the natural numbers, but is there a proof? - N. J. A. Sloane, Jul 10 2016
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 0..20000 [Based on Alois Heinz's b-file for A274640]
F. Michel Dekking, Jeffrey Shallit, and N. J. A. Sloane, Queens in exile: non-attacking queens on infinite chess boards, Electronic J. Combin., 27:1 (2020), #P1.52.
N. J. A. Sloane, Confessions of a Sequence Addict (AofA2017), slides of invited talk given at AofA 2017, Jun 19 2017, Princeton. Mentions this sequence.
EXAMPLE
From Jon E. Schoenfield, Dec 26 2016: (Start)
The spiral begins:
.
8--15---1---3---6--13--10--11---0---4---7
| |
16 7--14--13--12--11---8---9---5---6 2
| | | |
0 1 3--10---9---2---7---6---8 12 14
| | | | | |
7 8 6 2---4---5---0---1 3 11 10
| | | | | | | |
10 11 7 0 1---3---2 5 4 9 13
| | | | | | | | | |
14 6 5 4 2 0---1 3 7 10 11
| | | | | | | | |
13 9 2 1 3---4---5---0 6 8 12
| | | | | | |
6 10 8 5---0---1---3---4---2 7 9
| | | | |
3 12 4---6---7---8---9--10--11---5 0
| | |
11 13---9---8---5--12---4---2--14--15---6
|
9--14---0--11--15---7--13--12--10--17--16
.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 09 2016, based on the entry A274640 from Zak Seidov and Kerry Mitchell, Jun 30 2016
STATUS
approved