OFFSET
0,5
COMMENTS
Arithmetic hexagon of E. Lucas.
REFERENCES
E. Lucas, Théorie des nombres, Albert Blanchard, Paris, 1958, Tome 1, p. 89
LINKS
E. Lucas, Théorie des nombres, Tome 1, Jacques Gabay, Paris, 1991, p.89
FORMULA
EXAMPLE
Square array begins:
1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, ...
1, 2, 3, 4, 5, 5, 0, 0, 0, 0, 0, ...
1, 3, 6, 10, 15, 20, 20, 0, 0, 0, ...
1, 4, 10, 20, 35, 55, 75, 75, 0, 0, 0, ...
0, 4, 14, 34, 69, 124, 199, 274, 274, 0, 0, ...
0, 0, 14, 48, 117, 241, 440, 714, 988, 988, 0, ...
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Mar 14 2013
STATUS
approved