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

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A180051 Triangle T(n,k) read by rows. Matrix inverse of A180050. 1
1, -1, 1, 0, -1, 1, -1, -1, 3, 1, -1, -1, 6, 3, 1, -2, -1, 15, 7, 3, 1, -1, -1, 31, 15, 7, 3, 1, -2, -1, 72, 34, 16, 7, 3, 1, -2, -1, 157, 73, 34, 16, 7, 3, 1, -2, -1, 347, 161, 75, 35, 16, 7, 3, 1, -1, -1, 751, 349, 162, 75, 35, 16, 7, 3, 1, -2, -1, 1645, 763, 354, 164, 76, 35, 16, 7 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

At n>3, k=1 T(n,k)=A002321(n-1). It could perhaps be said that the Mertens function is an invariant under the recurrence in A180050 and matrix inversion.

LINKS

Table of n, a(n) for n=1..76.

EXAMPLE

Table begins:

1,

-1,1,

0,-1,1,

-1,-1,3,1,

-1,-1,6,3,1,

-2,-1,15,7,3,1,

-1,-1,31,15,7,3,1,

-2,-1,72,34,16,7,3,1,

-2,-1,157,73,34,16,7,3,1,

-2,-1,347,161,75,35,16,7,3,1,

-1,-1,751,349,162,75,35,16,7,3,1,

-2,-1,1645,763,354,164,76,35,16,7,3,1,

-2,-1,3553,1646,763,354,164,76,35,16,7,3,1,

-3,-1,7720,3576,1657,768,356,165,76,35,16,7,3,1,

CROSSREFS

Cf. A002321, A180050.

Sequence in context: A135494 A016566 A096744 * A160752 A186024 A080002

Adjacent sequences:  A180048 A180049 A180050 * A180052 A180053 A180054

KEYWORD

sign,tabl

AUTHOR

Mats Granvik, Aug 08 2010

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 August 17 01:56 EDT 2017. Contains 290631 sequences.