A122760 Triangle read by rows: t(n,m) = 2*3^m*(n mod 2).

0, 2, 6, 0, 0, 0, 2, 6, 18, 54, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 0, 0, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 1458, 4374, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset

1,2

Comments

A Cantor-based power of 3 triangular array.

References

Lynn Arthur Steen and J. Arthur Seebach, Jr., Counterexamples in Topology, Dover, New York, 1978, 57-58

Links

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

Example

0
2, 6
0, 0, 0
2, 6, 18, 54
0, 0, 0, 0, 0
2, 6, 18, 54, 162, 486
0, 0, 0, 0, 0, 0, 0
2, 6, 18, 54, 162, 486, 1458, 4374

Mathematica

b[n_] := 2*Mod[n, 2] T2[n_, m_] := 3^n*b[m] b0 = Table[Table[T2[n, m], {n, 0, m}], {m, 0, 10}]; Flatten[b0] MatrixForm[b0]

Crossrefs

Row sums: see A024101.

Sequence in context: A139062 A241861 A340984 * A358029 A208279 A186502

Adjacent sequences: A122757 A122758 A122759 * A122761 A122762 A122763

Keyword

nonn,tabl

Author

Roger L. Bagula, Sep 21 2006

Extensions

Edited and corrected by N. J. A. Sloane, May 29 2009

Status

approved