OFFSET
1,3
COMMENTS
Every odd number occurs exactly once above the diagonal and every even, exactly once below the diagonal.
EXAMPLE
Northwest corner:
0 1 3 7 13
2 0 5 9 15
6 4 0 11 17
12 8 10 0 19
T(1,4)=7 because in A097285 the unique occurrence of 1,4 is
in positions 7,8.
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 05 2004
STATUS
approved