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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216182 Riordan array ((1+x)/(1-x)^2, x(1+x)^2/(1-x)^2). 2
1, 3, 1, 5, 7, 1, 7, 25, 11, 1, 9, 63, 61, 15, 1, 11, 129, 231, 113, 19, 1, 13, 231, 681, 575, 181, 23, 1, 15, 377, 1683, 2241, 1159, 265, 27, 1, 17, 575, 3653, 7183, 5641, 2047, 365, 31, 1, 19, 833, 7183, 19825, 22363, 11969, 3303, 481, 35, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Triangle formed of odd-numbered columns of the Delannoy triangle A008288.

LINKS

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

FORMULA

T(2n, n) = A108448(n+1).

Sum_{k, 0<=k<=n} T(n,k) = A073717(n+1).

EXAMPLE

Triangle begins

1

3, 1

5, 7, 1

7, 25, 11, 1

9, 63, 61, 15, 1

11, 129, 231, 113, 19, 1

13, 231, 681, 575, 181, 23, 1

15, 377, 1683, 2241, 1159, 265, 27, 1

17, 575, 3653, 7183, 5641, 2047, 365, 31, 1

...

CROSSREFS

Cf. (columns:) A005408, A001845, A001847, A001849, A008419.

Cf. Diagonals: A000012, A004767, A060820.

Cf. A008288 (Delannoy triangle), A114123 (even-numbered columns of A008288).

Sequence in context: A320904 A193844 A201552 * A143524 A134249 A188509

Adjacent sequences:  A216179 A216180 A216181 * A216183 A216184 A216185

KEYWORD

nonn,tabl

AUTHOR

Philippe Deléham, Mar 11 2013

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 October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)