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!)
A177991 Triangle read by rows, A070909 * A177990 3
1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,8
COMMENTS
Row sums = A117142: (1, 2, 3, 5, 6, 9,...)
LINKS
FORMULA
As infinite lower triangular matrices, A070909 * A177990
EXAMPLE
First few rows of the triangle =
1;
1, 1;
1, 1, 1;
1, 2, 1, 1;
1, 2, 1, 1, 1;
1, 3, 1, 2, 1, 1;
1, 3, 1, 2, 1, 1, 1;
1, 4, 1, 3, 1, 2, 1, 1;
1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
...
CROSSREFS
Cf. A117142.
Sequence in context: A238747 A101873 A336691 * A146289 A214575 A081418
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 16 2010
EXTENSIONS
a(28)=1 inserted before the first "4" by Georg Fischer, Dec 28 2021
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 2 07:45 EST 2024. Contains 370460 sequences. (Running on oeis4.)