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A097288
Rectangular array read by antidiagonals obtained from A097287 by deleting the zeros.
0
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
OFFSET
1,1
COMMENTS
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: A077172 A160047 A249990 * A223894 A308573 A171178
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 05 2004
STATUS
approved