OFFSET
1,2
COMMENTS
Alternative (but equivalent) definition: In the following square array, numbers (not occurring earlier) are entered like this a(1, 1), a(1, 2), a(2, 1), a(3, 1), a(2, 2), a(1, 3), a(1, 4), a(2, 3), a(3, 2), a(4, 1), a(5, 1), a(4, 2), ... such that the n-th diagonal sum is a multiple of n. 1 2 7 6 18... 4 5 8 14... 3 9 12... 13 11... 10... ... sequence contains terms as they are entered.
CROSSREFS
KEYWORD
AUTHOR
Amarnath Murthy, Aug 27 2002
EXTENSIONS
Edited and extended by David Wasserman, Oct 31 2006
Further edited by N. J. A. Sloane Jan 17 2009 at the suggestion of R. J. Mathar
STATUS
approved