OFFSET
0,5
COMMENTS
Arithmetic hexagon of E. Lucas.
LINKS
E. Lucas, Théorie des nombres, Gauthier-Villars, Paris 1891, Tome 1, p. 89.
FORMULA
EXAMPLE
Square array begins:
1, 1, 1, 1, 1, 0, 0, 0, 0, 0, ... row n=0
1, 2, 3, 4, 5, 5, 0, 0, 0, 0, ... row n=1
0, 2, 5, 9, 14, 19, 19, 0, 0, 0, ... row n=2
0, 0, 5, 14, 28, 47, 66, 66, 0, 0, ... row n=3
0, 0, 0, 14, 42, 89, 155, 221, 221, 0, ... row n=4
0, 0, 0, 0, 42, 131, 286, 507, 728, 728, ... row n=5
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Mar 14 2013
STATUS
approved