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!)
A096809 Square table of signs, read by antidiagonals, where T(n,k)=(-1)^A096810(n,k); related to products of hypercomplex units. 2
1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..106.

FORMULA

See A096810 for definition.

EXAMPLE

The signs of the units in the table begin:

+ + + + + + + + + + + + + + + +

+ - + - + - + - + - + - + - + -

+ - - + + - - + + - - + + - - +

+ + - - + + - - + + - - + + - -

+ - - - - + + + + - - - - + + +

+ + + - - - + - + + + - - - + -

+ - + + - - - + + - + + - - - +

+ + - + - + - - + + - + - + - -

+ - - - - - - - - + + + + + + +

+ + + - + - + - - - + - + - + -

+ - + + + - - + - - - + + - - +

+ + - + + + - - - + - - + + - -

+ - - - + + + + - - - - - + + +

+ + + - - + + - - + + - - - + -

+ - + + - - + + - - + + - - - +

+ + - + - + - + - + - + - + - -

PROG

(PARI) T(n, k)=local(mx, D=6); if(n<0 || k<0, 0, mx=matrix(2^D, 2^D); mx[2, 1]=2; mx[2, 2]=1; for(i=1, D-1, for(r=1, 2^i, for(c=1, 2^i, mx[r, c+2^i]=mx[r, c]; mx[r+2^i, c]=mx[r, c]; mx[r+2^i, c+2^i]=mx[r, c]); mx[1+2^i, r]+=1; mx[r+2^i, r]+=1; mx[r+2^i, 1+2^i]+=1; )); (-1)^mx[n+1, k+1])

CROSSREFS

Cf. A096810.

Sequence in context: A162285 A186035 A071935 * A131561 A110515 A071936

Adjacent sequences:  A096806 A096807 A096808 * A096810 A096811 A096812

KEYWORD

sign,tabl

AUTHOR

Paul D. Hanna, Jul 21 2004

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 June 19 00:04 EDT 2021. Contains 345125 sequences. (Running on oeis4.)