This site is supported by donations to The OEIS Foundation.

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A128432 Triangle read by rows: A128407 * A054521. 0

%I

%S 1,-1,0,-1,-1,0,0,0,0,0,-1,-1,-1,-1,0,1,0,0,0,1,0,-1,-1,-1,-1,-1,-1,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,1,0,1,0

%N Triangle read by rows: A128407 * A054521.

%C Row sums = A023900: (1, -1, -2, 0, -4, 2, -6,...) Left border = mu(n), A008683.

%F A128407 * A054521 as infinite lower triangular matrices.

%e First few rows of the triangle are:

%e 1;

%e -1, 0;

%e -1, -1, 0;

%e 0, 0, 0, 0;

%e -1, -1, -1, -1, 0;

%e 1, 0, 0, 0, 1, 0;

%e -1, -1, -1, -1, -1, -1, 0;

%e 0, 0, 0, 0, 0, 0, 0, 0;

%e ...

%Y Cf. A128407, A054521, A008683, A023900.

%K tabl,sign

%O 1,1

%A _Gary W. Adamson_, Mar 03 2007

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