A097287 Rectangular array T by antidiagonals: T(n,k) = rank of n where (n,k) occurs in A097285, for distinct n,k and T(n,n)=0 for all n.

0, 1, 2, 3, 0, 6, 7, 5, 4, 12, 13, 9, 0, 8, 20, 21, 15, 11, 10, 14, 30, 31, 23, 17, 0, 16, 22, 42, 43, 33, 25, 19, 18, 24, 32, 56, 57, 45, 35, 27, 0, 26, 34, 44, 72, 73, 59, 47, 37, 29, 28, 36, 46, 58, 90, 91, 75, 61, 49, 39, 0, 38, 48, 60, 74, 110, 111, 93, 77, 63, 51, 41, 40, 50, 62

Offset: 1

Author

Clark Kimberling, Aug 05 2004

Keywords

• nonn
• tabl

Comments

Every odd number occurs exactly once above the diagonal and every even, exactly once below the diagonal.

Examples

			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.