2,2

S. K. Stein and S. Szabo, The number of distinct symbols in sections of rectangular arrays, Discr. Math., 306 (2006), 254-261.

Table of n, a(n) for n=2..16.

Array begins

1

5 2

7 3 3

9 7 4 3

11 8 5 5 4

13 10 8 ...

See A115321 for transposed array.

Sequence in context: A185581 A151960 A281300 * A073480 A077057 A030660

Adjacent sequences: A115317 A115318 A115319 * A115321 A115322 A115323

nonn,tabl

N. J. A. Sloane, Mar 07 2006

approved