login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A133083 A000012 * A133080. 2
1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A032766, congruent to {0,1} mod 3: (1, 3, 4, 6, 7, 9, 10,...)

LINKS

G. C. Greubel, Table of n, a(n) for the first 50 rows, flattened

FORMULA

A000012 * A133080 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

2, 1;

2, 1, 1;

2, 1, 2, 1;

2, 1, 2, 1, 1;

2, 1, 2, 1, 2, 1;

...

MATHEMATICA

T[n_, k_] := If[k == n, 1, 1  + (1 - (-1)^k)/2 ]; Table[T[n, k], {n, 1, 10}, {k, 1, n}] (* G. C. Greubel, Oct 21 2017 *)

PROG

(PARI) for(n=1, 10, for(k=1, n, print1(if(k==n, 1, 1 + (1-(-1)^k)/2), ", "))) \\ G. C. Greubel, Oct 21 2017

CROSSREFS

Cf. A133080, A000012, A032766.

Sequence in context: A214848 A006338 A020903 * A083921 A119672 A271608

Adjacent sequences:  A133080 A133081 A133082 * A133084 A133085 A133086

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Sep 08 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 May 7 23:48 EDT 2021. Contains 343652 sequences. (Running on oeis4.)