login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A129688 A129686 * A128174. 2
1, 0, 1, 2, 0, 1, 0, 2, 0, 1, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 1, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 1, 2, 0, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Resulting triangle has (1, 0, 2, 0, 2, 0, 2,...) in every column.

Row sums = A109613: (1, 1, 3, 3, 5, 5,...).

LINKS

Table of n, a(n) for n=1..55.

FORMULA

A129686 * A128174 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

0, 1;

2, 0, 1;

0, 2, 0, 1;

2, 0, 2, 0, 1;

...

MATHEMATICA

T[n_, k_] := If[k == n, 1, If[EvenQ[n + k], 2, 0]];

Table[T[n, k], {n, 1, 10}, {k, 1, n}] // Flatten (* Jean-Fran├žois Alcover, Jul 10 2019 *)

CROSSREFS

Cf. A129686, A128174, A109613.

Sequence in context: A091603 A325036 A194942 * A309011 A086713 A275730

Adjacent sequences:  A129685 A129686 A129687 * A129689 A129690 A129691

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Apr 28 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 23 17:33 EST 2022. Contains 350514 sequences. (Running on oeis4.)