login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A112477 Riordan array ((1-x+sqrt(1+6x+x^2))/2, (sqrt(1+6x+x^2)-x-1)/2). 2

%I #5 Dec 16 2018 23:48:19

%S 1,1,1,-2,-1,1,6,2,-3,1,-22,-6,10,-5,1,90,22,-38,22,-7,1,-394,-90,158,

%T -98,38,-9,1,1806,394,-698,450,-194,58,-11,1,-8558,-1806,3218,-2126,

%U 978,-334,82,-13,1,41586,8558,-15310,10286,-4942,1838,-526,110,-15,1,-206098,-41586,74614,-50746,25150,-9922,3142,-778,142

%N Riordan array ((1-x+sqrt(1+6x+x^2))/2, (sqrt(1+6x+x^2)-x-1)/2).

%e Triangle starts

%e 1;

%e 1,1;

%e -2,-1,1;

%e 6,2,-3,1;

%e -22,-6,10,-5,1;

%e 90,22,-38,22,-7,1;

%Y Inverse of triangle A112475. Row sums are A112478.

%K easy,sign,tabl

%O 0,4

%A _Paul Barry_, Sep 07 2005

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)