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A122759
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Triangle T(n,m) read by rows: 3^n if m is odd, 0 if m is even.
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0
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1, 0, 0, 1, 3, 9, 0, 0, 0, 0, 1, 3, 9, 27, 81, 0, 0, 0, 0, 0, 0, 1, 3, 9, 27, 81, 243, 729, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 9, 27, 81, 243, 729, 2187, 6561, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 9, 27, 81, 243, 729, 2187, 6561, 19683, 59049
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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REFERENCES
| Lynn Arthur Steen and J. Arthur Seebach, Counterexamples in Topology, Dover (1978) 57-58
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FORMULA
| T(n,2*m) = 0. T(n,2*m+1) = 3^n.
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EXAMPLE
| 1
0, 0
1, 3, 9
0, 0, 0, 0
1, 3, 9, 27, 81
0, 0, 0, 0, 0, 0
1, 3, 9, 27, 81, 243, 729
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MATHEMATICA
| a[n_] := 1 - Mod[n, 2] T1[n_, m_] := 3^n*a[m] a0 = Table[Table[T1[n, m], {n, 0, m}], {m, 0, 10}]; Flatten[a0] MatrixForm[a0]
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CROSSREFS
| Sequence in context: A063103 A058847 A088110 * A200495 A016626 A126321
Adjacent sequences: A122756 A122757 A122758 * A122760 A122761 A122762
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KEYWORD
| nonn,tabl,easy,less
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AUTHOR
| Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 21 2006
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EXTENSIONS
| Definition simplified by the Assoc. Eds. of the OEIS, Mar 27 2010
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