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