login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120111 Bi-diagonal inverse matrix of A120108. 3
1, -2, 1, 0, -3, 1, 0, 0, -2, 1, 0, 0, 0, -5, 1, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, -7, 1, 0, 0, 0, 0, 0, 0, -2, 1, 0, 0, 0, 0, 0, 0, 0, -3, 1, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -11, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Sub-diagonal is -lcm(1,...,n+2)/lcm(1,...,n+1) or -A014963(n+1). Row sums are A120112.

LINKS

Table of n, a(n) for n=0..65.

EXAMPLE

Triangle begins

1,

-2, 1,

0, -3, 1,

0, 0, -2, 1,

0, 0, 0, -5, 1,

0, 0, 0, 0, -1, 1,

0, 0, 0, 0, 0, -7, 1,

0, 0, 0, 0, 0, 0, -2, 1,

0, 0, 0, 0, 0, 0, 0, -3, 1,

0, 0, 0, 0, 0, 0, 0, 0, -1, 1,

0, 0, 0, 0, 0, 0, 0, 0, 0, -11, 1

CROSSREFS

Sequence in context: A238942 A082754 A063173 * A130055 A202452 A127013

Adjacent sequences:  A120108 A120109 A120110 * A120112 A120113 A120114

KEYWORD

easy,sign,tabl

AUTHOR

Paul Barry, Jun 09 2006

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 February 28 09:52 EST 2020. Contains 332323 sequences. (Running on oeis4.)