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A097283 Contains exactly once every pair (i,j) satisfying 0 < i < j. 2
1, 2, 1, 3, 1, 4, 2, 3, 1, 5, 2, 4, 1, 6, 2, 5, 3, 4, 1, 7, 2, 6, 3, 5, 1, 8, 2, 7, 3, 6, 4, 5, 1, 9, 2, 8, 3, 7, 4, 6, 1, 10, 2, 9, 3, 8, 4, 7, 5, 6, 1, 11, 2, 10, 3, 9, 4, 8, 5, 7, 1, 12, 2, 11, 3, 10, 4, 9, 5, 8, 6, 7, 1, 13, 2, 12, 3, 11, 4, 10, 5, 9, 6, 8, 1, 14, 2, 13, 3, 12, 4, 11, 5, 10, 6, 9, 7, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

All pairs (i,j) having i > j occur except those of the form (i,i-1) for i>=3. (Those are included at A097285.)

LINKS

Table of n, a(n) for n=1..98.

EXAMPLE

Terms are lexically ordered in pairs by sum:

1 2 (sum = 3)

1 3 (sum = 4)

1 4 2 3 (two pairs having sum = 5), etc.

CROSSREFS

Cf. A097284, A097285.

Sequence in context: A079617 A079616 A292587 * A296119 A300836 A118314

Adjacent sequences:  A097280 A097281 A097282 * A097284 A097285 A097286

KEYWORD

nonn

AUTHOR

Clark Kimberling, Aug 05 2004

STATUS

approved

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Last modified November 20 17:09 EST 2019. Contains 329337 sequences. (Running on oeis4.)