OFFSET
1,2
COMMENTS
An infinite Sudoku-type array.
Here, "diagonal" means a diagonal line with an inclination of -60 degrees, and "antidiagonal" means a diagonal line with an inclination of 60 degrees. Thus, the index-7 cell is in the same row as prior cells of indices 5 and 6, in the same diagonal as prior cells of indices 2 and 6, and in the same antidiagonal as the prior cell of index 4.
Triangular tiling is indexed as follows:
*
/ \
/ 1 \
*-----*
/ \ 3 / \
/ 2 \ / 4 \
*-----*-----*
/ \ 6 / \ 8 / \
/ 5 \ / 7 \ / 9 \
*-----*-----*-----*
LINKS
Alec Jones, Table of n, a(n) for n = 1..5000
EXAMPLE
Triangle begins:
*
/ \
/ 1 \
*-----*
/ \ 3 / \
/ 2 \ / 4 \
*-----*-----*
/ \ 5 / \ 2 / \
/ 4 \ / 1 \ / 6 \
*-----*-----*-----*
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Alec Jones and Peter Kagey, Sep 06 2020
STATUS
approved