A122759 Triangle T(n,m) read by rows: 3^n if m is odd, 0 if m is even.

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

Offset

1,5

References

Lynn Arthur Steen and J. Arthur Seebach, Counterexamples in Topology, Dover (1978) 57-58

Links

Table of n, a(n) for n=1..66.

Formula

T(n,2*m) = 0. T(n,2*m+1) = 3^n.

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

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]

Crossrefs

Sequence in context: A063103 A058847 A088110 * A247042 A274400 A200495

Adjacent sequences: A122756 A122757 A122758 * A122760 A122761 A122762

Keyword

nonn,tabl,easy,less

Author

Roger L. Bagula, Sep 21 2006

Extensions

Definition simplified by the Assoc. Eds. of the OEIS, Mar 27 2010

Status

approved