OFFSET
1,2
LINKS
Carole Dubois, Table of n, a(n) for n = 1..1002
Eric Angelini, More Manhattan distinct distances, Feb. 7th, 2022, personal blog.
EXAMPLE
[1, 2, 3, 5, 4, 7] is a closed circuit on a square grid formed by going 1 cell up (North), 2 cells to the right (East), 3 cells up again (North), 5 cells to the right again (East), 4 cells down (South) and 7 cells to the left (West); the next smallest such circuit is given by [6, 8, 9, 10, 15, 18] as all the terms of the final sequence must be distinct; the next circuit is [11, 12, 13, 14, 24, 26], etc. Concatenating all circuits gives the sequence.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Feb 07 2022
STATUS
approved