OFFSET
1,3
COMMENTS
This is the lexicographically earliest permutation of the nonnegative integers with this property.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..2757
EXAMPLE
The four integers inside each of the four 2 X 2 squares that contain 0 sum up to a palindrome: 0+1+2+3=6 / 0+3+4+15=22 / 0+15+5+13=33 / 0+13+8+1=22. This is true for any 2 X 2 square picked up on the (infinite) grid: the upper right corner below sums up to 88 for instance (17+22+43+6).
.
14--16--32--24--17--22
| |
20 5--13-- 8---6 43
| | |
26 15 0---1 7
| | | |
21 4---3---2 12
| |
11--19--18--10-- 9
.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Aug 16 2020
STATUS
approved