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

Author

Roger L. Bagula, Sep 21 2006

Keywords

• nonn
• tabl

Comments

A Cantor-based power of 3 triangular array.

Examples

			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
		

References

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

Crossrefs

Row sums: see A024101.

Programs

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]

Extensions

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