

A135871


Triangle by columns: A013610 signed and interleaved with zeros.


1



1, 0, 3, 1, 0, 9, 0, 6, 0, 27, 1, 0, 27, 0, 81, 0, 9, 0, 108, 0, 243, 1, 0, 54, 0, 405, 0, 729, 0, 12, 0, 270, 0, 1458, 0, 2187
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OFFSET

1,3


COMMENTS

Row sums = even indexed Fibonacci numbers, A001906: (1, 3, 8, 21, 55,...) such that the sum of nth row terms = F(2n). Example: sum of nonzero terms of row 4 = ( 6 + 27) = 21 = F(8).


LINKS

Table of n, a(n) for n=1..36.


FORMULA

The triangle starts with A013610, then by columns sign (+, , +,...) and interleave with zeros.


EXAMPLE

First few rows of the triangle are:
1;
0, 3;
1, 0, 9;
0, 6, 0, 27;
1, 0, 27, 0, 81;
0, 9, 0, 108, 0, 243;
1, 0, 54, 0, 405, 0, 729;
...


CROSSREFS

Cf. A013610, A001906.
Sequence in context: A162971 A078521 A194938 * A126178 A094753 A221713
Adjacent sequences: A135868 A135869 A135870 * A135872 A135873 A135874


KEYWORD

tabl,sign


AUTHOR

Gary W. Adamson, Dec 02 2007


STATUS

approved



