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!)
A128137 A002260 * A128132. 1
1, -1, 4, -1, 1, 9, -1, 1, 5, 16, -1, 1, 5, 11, 25, -1, 1, 5, 11, 19, 36, -1, 1, 5, 11, 19, 29, 49, -1, 1, 5, 11, 19, 29, 41, 64, -1, 1, 5, 11, 19, 29, 41, 55, 81, -1, 1, 5, 11, 19, 29, 41, 55, 71, 100 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Deleting the right and left borders gives terms of A028387: (1, 5, 11, 29, 29, 41, 55, 71, ...). Row sums = A064999: (1, 3, 9, 21, 41, ...).
LINKS
FORMULA
A002260 * A128132 as infinite lower triangular matrices.
EXAMPLE
First few rows of the triangle:
1;
-1, 4;
-1, 1, 9;
-1, 1, 5, 16;
-1, 1, 5, 11, 25;
-1, 1, 5, 11, 19, 36;
-1, 1, 5, 11, 19, 29, 49;
...
CROSSREFS
Sequence in context: A272867 A206438 A331148 * A232530 A346877 A231987
KEYWORD
tabl,sign
AUTHOR
Gary W. Adamson, Feb 16 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)