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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106314 Triangle composed of squares, row sums = Paraffin numbers. 5
1, 1, 1, 1, 4, 1, 1, 4, 4, 1, 1, 4, 9, 4, 1, 1, 4, 9, 9, 4, 1, 1, 4, 9, 16, 9, 4, 1, 1, 4, 9, 16, 16, 9, 4, 1, 1, 4, 9, 16, 25, 16, 9, 4, 1, 1, 4, 9, 16, 25, 25, 16, 9, 4, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Row sums = A005993, Paraffin numbers: 1, 2, 6, 10, 19, 28, 44, 60...

Row sums are; {1, 2, 6, 10, 19, 28, 44, 60, 85, 110, 146,...}

LINKS

Table of n, a(n) for n=1..55.

FORMULA

Given the triangle of A003983, replace each of the terms by its square.

p(x,n)=Sum[x^i*If[i == Floor[n/2] && Mod[n, 2] == 0, 0, If[i <= ( then than equal) Floor[n/2], 2*i + 1, -(2*(n - i) + 1)]], {i, 0, n}]/(1 - x);

t(n,m)=coefficients(p(x,n),x)

EXAMPLE

The triangle of A003983 is:

1;

1, 1;

1, 2, 1;

1, 2, 2, 1;

1, 2, 3, 2, 1;

...

Replacing each term by its square, we get:

1;

1, 1;

1, 4, 1;

1, 4, 4, 1;

1, 4, 9, 4, 1;

...

{1},

{1, 1},

{1, 4, 1},

{1, 4, 4, 1},

{1, 4, 9, 4, 1},

{1, 4, 9, 9, 4, 1},

{1, 4, 9, 16, 9, 4, 1},

{1, 4, 9, 16, 16, 9, 4, 1},

{1, 4, 9, 16, 25, 16, 9, 4, 1},

{1, 4, 9, 16, 25, 25, 16, 9, 4, 1},

{1, 4, 9, 16, 25, 36, 25, 16, 9, 4, 1} (End)

MATHEMATICA

Clear[p, n, i];

p[x_, n_] = Sum[x^i*If[i ==Floor[n/2] && Mod[n, 2] == 0, 0, If[i <= Floor[n/2], 2*i + 1, -(2*(n - i) + 1)]], {i, 0, n}]/(1 - x);

Table[CoefficientList[FullSimplify[p[x, n]], x], {n, 1, 11}];

Flatten[%]

CROSSREFS

Cf. A003983, A106314, A005993.

Sequence in context: A046596 A174093 A204028 * A152716 A183374 A176263

Adjacent sequences:  A106311 A106312 A106313 * A106315 A106316 A106317

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Apr 28 2005

EXTENSIONS

Additional comments from Roger L. Bagula and Gary W. Adamson, Apr 02 2009

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified April 24 19:08 EDT 2014. Contains 240988 sequences.