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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A143908 Eigentriangle by rows, n terms of (3 * A026150) followed by A026150(n). 1
1, 3, 1, 3, 3, 4, 3, 3, 12, 10, 3, 3, 12, 30, 28, 3, 3, 12, 30, 84, 76, 3, 3, 12, 30, 84, 228, 208, 3, 3, 12, 30, 84, 228, 624, 568, 3, 3, 12, 30, 84, 228, 624, 1704, 1552 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Right border = A026150: (1, 1, 4, 10, 28, 76, 208, 568,...).

Row sums = (1, 4, 10, 28, 76,...) = INVERT transform of (1, 3, 3, 3,...).

Sum of n-th row terms = rightmost term of next row.

LINKS

Table of n, a(n) for n=0..44.

FORMULA

Eigentriangle by rows, n terms of (3 * A026150) followed by A026150(n).

EXAMPLE

First few rows of the triangle =

1;

3, 1;

3, 3, 4;

3, 3, 12, 10;

3, 3, 12, 30, 28;

3, 3, 12, 30, 84, 76;

3, 3, 12, 30, 84, 228, 208;

...

CROSSREFS

A026150

Sequence in context: A243339 A244965 A049996 * A117572 A029153 A060241

Adjacent sequences:  A143905 A143906 A143907 * A143909 A143910 A143911

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Sep 06 2008

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 26 05:43 EDT 2019. Contains 321481 sequences. (Running on oeis4.)