OFFSET
2,2
LINKS
S. K. Stein and S. Szabo, The number of distinct symbols in sections of rectangular arrays, Discr. Math., 306 (2006), 254-261.
EXAMPLE
Array begins
1
5 2
7 3 3
9 7 4 3
11 8 5 5 4
13 10 8 ...
CROSSREFS
KEYWORD
AUTHOR
N. J. A. Sloane, Mar 07 2006
STATUS
approved