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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131127 Table read by rows: 2*A007318(n,m) - (-1)^(n+m)*A097806(n,m). 3
1, 3, 1, 2, 5, 1, 2, 6, 7, 1, 2, 8, 12, 9, 1, 2, 10, 20, 20, 11, 1, 2, 12, 30, 40, 30, 13, 1, 2, 14, 42, 70, 70, 42, 15, 1, 2, 16, 56, 112, 140, 112, 56, 17, 1, 2, 18, 72, 168, 252, 252, 168, 72, 19, 1, 2, 20, 90, 240, 420, 504, 420, 240, 90, 21, 1, 2, 22, 110, 330, 660, 924, 924, 660, 330, 110, 23, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A000079(n+1), n>0.

Warning: row sums are not A046055! - N. J. A. Sloane, Jul 08 2009

Row sums = A151821(n+1), n>=0. - Alois P. Heinz, Jul 13 2009

LINKS

Alois P. Heinz, Rows n = 0..140, flattened

FORMULA

2*A007318 - A097806 (signed), A007318 = Pascal's triangle and using the signed version of the pair operator A097806 with (1,1,1,...) in the main diagonal and (-1,-1,-1,...) in the subdiagonal.

EXAMPLE

First few rows of the triangle are:

1;

3, 1;

2, 5, 1;

2, 6, 7, 1;

2, 8, 12, 9, 1;

2, 10, 20, 20, 11, 1;

...

MAPLE

T:= (n, m)-> 2*binomial(n, m) -(-1)^(n+m)*`if`(n=m or n=m+1, 1, 0): seq(seq(T(n, m), m=0..n), n=0..12); # Alois P. Heinz, Jul 13 2009

MATHEMATICA

T[n_, m_] := 2*Binomial[n, m] - (-1)^(n+m)*If[n == m || n == m+1, 1, 0];

Table[Table[T[n, m], {m, 0, n}], {n, 0, 12}] // Flatten (* Jean-Fran├žois Alcover, May 19 2016, translated from Maple *)

CROSSREFS

Cf. A097806, A007318.

Sequence in context: A211025 A080521 A125704 * A113141 A134225 A136081

Adjacent sequences:  A131124 A131125 A131126 * A131128 A131129 A131130

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jun 16 2007

EXTENSIONS

Edited by N. J. A. Sloane and R. J. Mathar, Jul 09 2009

Corrected and extended by Alois P. Heinz, Jul 13 2009

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified March 25 19:24 EDT 2017. Contains 284082 sequences.