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A097288 Rectangular array read by antidiagonals obtained from A097287 by deleting the zeros. +0
1
2, 1, 6, 3, 4, 12, 7, 5, 8, 20, 13, 9, 10, 14, 30, 21, 15, 11, 16, 22, 42, 31, 23, 17, 18, 24, 32, 56, 43, 33, 25, 19, 26, 34, 44, 72, 57, 45, 35, 27, 28, 36, 46, 58, 90, 73, 59, 47, 37, 29, 38, 48, 60, 74, 110, 91, 75, 61, 49, 39, 40, 50, 62, 76, 92, 132, 111, 93, 77, 63, 51 (list; table; graph; listen)
OFFSET

1,1

COMMENT

As a sequence, this is a permutation of the natural numbers. Evens lie on or below the main diagonal; odds, above. The triangle formed by the evens is twice that of A066182.

EXAMPLE

Northwest corner:

2 1 3 7 13

6 4 5 9 15

12 8 10 11 17

20 14 16 18 19

CROSSREFS

Cf. A097287.

Sequence in context: A124443 A077172 A160047 this_sequence A100014 A062566 A126265

Adjacent sequences: A097285 A097286 A097287 this_sequence A097289 A097290 A097291

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), Aug 05 2004

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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