login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A177992 Triangle read by rows, A007318 * A177990. 3
1, 1, 1, 1, 3, 1, 1, 7, 5, 1, 1, 15, 6, 5, 1, 1, 31, 10, 16, 5, 1, 1, 63, 15, 42, 15, 7, 1, 1, 127, 21, 99, 35, 29, 7, 1, 1, 255, 28, 219, 70, 93, 28, 9, 1, 1, 511, 36, 466, 126, 256, 84, 46, 9, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums = A045623: (1, 2, 5, 12, 28, 64, 144,...).

LINKS

Table of n, a(n) for n=0..54.

FORMULA

As infinite lower triangular matrices, A007318 * A177990

EXAMPLE

First few rows of the triangle =

1;

1, 1;

1, 3, 1;

1, 7, 3, 1;

1, 15, 6, 5, 1;

1, 31, 10, 16, 5, 1;

1, 63, 15, 42, 15, 7, 1;

1, 127, 21, 99, 35, 29, 7, 1;

1, 255, 28, 219, 70, 93, 28, 9, 1;

1, 511, 36, 466, 126, 256, 84, 46, 9, 1;

1, 1023, 45, 968, 210, 638, 210, 176, 45, 11, 1;

1, 2047, 55, 1981, 330, 1486, 462, 562, 165, 67, 11, 1;

1, 4095, 66, 4017, 495, 3302, 924, 1586, 495, 299, 66, 13, 1;

...

CROSSREFS

Cf. A177993 = A177990 * A007318.

Cf. A045623.

Sequence in context: A205099 A136621 A108625 * A112857 A118801 A080936

Adjacent sequences:  A177989 A177990 A177991 * A177993 A177994 A177995

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 16 2010

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 March 19 23:02 EDT 2019. Contains 321343 sequences. (Running on oeis4.)