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A097291
Contains exactly once every pair (i,j) of positive integers.
4
1, 1, 2, 2, 1, 3, 3, 2, 3, 1, 4, 4, 2, 4, 3, 4, 1, 5, 5, 2, 5, 3, 5, 4, 5, 1, 6, 6, 2, 6, 3, 6, 4, 6, 5, 6, 1, 7, 7, 2, 7, 3, 7, 4, 7, 5, 7, 6, 7, 1, 8, 8, 2, 8, 3, 8, 4, 8, 5, 8, 6, 8, 7, 8, 1, 9, 9, 2, 9, 3, 9, 4, 9, 5, 9, 6, 9, 7, 9, 8, 9, 1, 10, 10, 2, 10, 3, 10, 4, 10, 5, 10, 6, 10, 7, 10, 8, 10, 9, 10
OFFSET
1,3
COMMENTS
The pairs (i,j) are ordered in segments thus: segment 1: 1 segment 2: 1 2 2 segment 3: 1 3 3 2 3 segment 4: 1 4 4 2 4 3 4 segment 5: 1 5 5 2 5 3 5 4 5 and so on.
CROSSREFS
Cf. A098289.
Sequence in context: A182535 A181186 A364197 * A269501 A254044 A274515
KEYWORD
nonn
AUTHOR
Clark Kimberling, Aug 05 2004
STATUS
approved