OFFSET
2,5
COMMENTS
This triangle arose in connection with a problem involving "lunar arithmetic".
Take the triangle formed by the antidiagonals of A156041 and reverse each row.
LINKS
D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
EXAMPLE
Triangle begins:
1,
1, 1,
1, 2, 1,
1, 3, 2, 1,
1, 4, 4, 3, 1,
1, 5, 7, 6, 3, 1,
1, 6, 11, 11, 8, 4, 1,
1, 7, 16, 19, 17, 11, 4, 1,
1, 8, 22, 31, 32, 26, 13, 5, 1,
1, 9, 29, 48, 56, 54, 35, 17, 5, 1,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Feb 26 2011
STATUS
approved